Identify and interpret the decay factor for each of the following. a.) P= 400×(0.43)^t decay factor: 0.43 This means that the function decays by ___?___ % b.) f(t)= 3800×(0.84)^t decay factor: 0.84 This means that the function decays by ___?___

20,298 results
  1. Exponential Growth and Decay

    Can somebody please check my answers? 1. Identify the initial amount a and the growth factor b in the exponential function. g(x)=14*2^x a)a=14, b=x b)a=14, b=2

  2. Algebra 2

    For the annual rate of change of +70%, find the corresponding growth or decay factor. 0.70 1.70 170 70 For the annual rate of change of -75%, find the corresponding growth or decay factor. -75 1.25 -0.75 0.25 I'm confused, please help? How can I solve

  3. Math

    Find the initial value a, growth/decay factor b, and growth/decay rate r for the following exponential function: Q(t)=0.0036(2.58)^−4t a) The initial value is a= (b) The growth factor is b= (c) The growth rate is r=

  4. Physics

    Suppose you are provided with 500 dice.calculate the number of throws that is equivalent to one half life and the decay costant for the process.under radioactivity decay analogue experiment

  5. Chemistry

    The complete decay of Americium-241 involves successively with a (alpha), a, B(beta), a, a, B, a, a, a, B, a production. Identify the 11 intermediate nuclides. I did the first one, ^241_95 Am--> ^4_2He + ^237_93Np (hopes that doesn't look too confusing, ^

  6. chemistry

    How long will it take for 25% of the C-14 atoms in a sample of C-14 to decay? The half-life for the radioactive decay of C-14 is 5730 years. If a sample of C-14 initially contains 1.1 mmol of C-14 , how many millimoles will be left after 2275 years?

  7. Calculus

    The rate of decay is proportional to the mass for radioactive material. For a certain radioactive isotope, this rate of decay is given by the differential equation dm/dt = -.022m, where m is the mass of the isotope in mg and t is the time in years. A. If

  8. algebra 2

    identify y= 3 (1.2)^x as an example of growth or decay. what is the y- intercept.

  9. Math

    Does the function represent exponential growth or exponential decay. Identify the growth or decay factor. y=9 x (1/2) I'm not sure how to make the chart to show the decay.

  10. nuclear physics

    1) write the proper nuclear reactions for the following: A) beta-decay of radon-222 B) Alpha-decay of uranium-238 2) how does the CANDU reactor work?

  11. science help

    Two factors which cause global climate change are listed below. Factor 1: Volcanic eruptions. Factor 2: Changes in the amount of Sun’s heat received by the Earth’s atmosphere and surface. Which of these statements is correct about the two factors which

  12. algebra

    what is the decay rate: initial amount: 6 decay factor: 0.98 decay factor: ?

  13. chem

    Potassium-40 undergoes three different modes of radioactive decay (Beta decay, Positron decay, and Electron Capture decay). Write balanced nuclear reactions for each of these decay modes. Are the products stable (not radioactive)?

  14. math

    Identify the initial value and growth or decay factor in each of the following exponential functions: a) y= 350 x 5^x b) Q= 25000 x (1/2)^t c) P=(7 x 10^3) x 4^t d) N= 5000 x (9/10)^t

  15. Mathematics

    How do I do these? 1. Simplify using only positive exponents: (2t)⁻⁶ 2. Simplify using only positive exponents: (w⁻²j⁻⁴)⁻³(j⁷j³) 3. Simplify using only positive exponents: a²b⁻⁷c⁴ ---------- a⁵b³c⁻² 4. Evaluate the expression

  16. math

    Sam bought a new car for $26,500. The car depreciates approximately 13% of its value each year. A) What is the decay factor for the value of this car? b) Write an equation to model the decay value of this car? c) What will the value of the car be in 10

  17. Algebra 2

    Examine the polynomial p(x)=6x^3+17x^2−24x−35. Use the Factor Theorem to identify which binomial is a factor of p(x). a.3x+5 b.2x+7 c.x−1 d.2x−7 I thought that 2x+7 was a factor of p(x) but I don't know and I am confused now can somebody help

  18. Chemistry

    Predict the mode of decay for Mn-59. a. beta decay

  19. Math

    Use the Factor Theorem to determine whether x-3 is a factor of P(x)=2x^3-5x^-9 . Specifically, evaluate P at the proper value, and then determine whether x-3 is a factor. P(_)=__ also pick which one applies x-3 is not a factor of P(x) x-3 is a factor of

  20. chem

    Write a partial decay series for Rn-220 undergoing the following sequential decays: á (alpha decay), á, â(beta decay), á. (Enter the mass number in the first raised box, the atomic number in the second lower box and the symbol of the element in the

  21. Math

    Exponential function N= 500x0.74^t what is the monthly decay factor? What is the monthly percentage decay rate? What is the percentage decay rate per second?

  22. Chemistry - radioactivity

    Hello Dr.Bob. Could you check my work please? I'm not sure if I'm right in how I solved this problem. Which of the following nuclides are most likely to decay via beta decay? A) I-131 B) Pb-206 C) F-18 D) Zr-90 E) Ar-40 I know that nuclides undergo beta

  23. Chemistry

    There are several technological applications for the transuranium elements (Z > 92). An important one is in smoke detectors, which can use the decay of a tiny amount of americium-241 to neptunium-237.What subatomic particle is emitted from that decay

  24. Emergancy help!!!!!!!!!

    Classify the model as exponential growth or exponential decay. Identify the growth or decay factor and the percent increase or decrease per time period. y=16(1.25)^t

  25. Math (3 of 4 question)

    9. Does the function represent exponential growth or exponential decay? Identify the growth or decay factor. = 9 ∙ (1/2)ˣ

  26. Algebra 1

    Identify the initial amount a and the decay factor b in each exponential function. 1.) y= 0.1* 0.9^x

  27. chemistry

    these two radioactive elements decay by electron capture (EC). Write the nuclear reactions for each decay including the formation of the daughter products: a. 35 S + 0 e → 16 -1 b. 69 Sr + 0 e → 35 -1

  28. Math

    Classify the model as exponential growth or exponential decay. Identify the growht or decay factor and the percent increase or decrease per time period.

  29. math

    Sam bought a new car for $26,500. The car depreciates approximately 13% of its value each year. a) What is the decay factor for the value of this car? b) Write an equation to model the decay value of this car?

  30. Physic

    A radioactive element x has half life of 30 days and will decay to become another new element Y.. a) calculate decay constant b) how long it will take for 90% of the no.Of atom in radioisotope x to decay?

  31. Algebra

    Determine if the equation y = 2^x represents exponential growth or decay I thought at first it was growth but now I think it might be decay because there is no "b" in a parentheses so do I assume b is less than 1 so it's decay? Please help

  32. Math

    So I figured out how to do the first 6, how do I do the remaining? 7. Evaluate the function below over the domain {-1, 0, 1, 2}. As the values of the domain increase, do the values of the function increase or decrease? y = (3/4)ˣ 8. Suppose an investment

  33. science

    Which statement best explains why dating geologic materials from the Quarternary Period uses a different radioactive isotope than for materials from the cambrian Period? a. all rocks contain radioactive substances. b. some isotopes decay faster than

  34. Science

    Which of the following characteristics x-ray photon emission? (a)electron capture (b)beta-decay (c)positron emmision (d)gamma-decay

  35. Chemistry

    It takes about 10^16 years for just half the samarium-149 in nature to decay by alpha-particle emission. Write the decay equation, and find the isotope that is produced by the reaction.

  36. Algebra 1

    1.the number of bacteria present in a colony is 180 at 12 noon and the bacteria grows at a rate of 22% per hour. how many will be present at 8pm? 2.A 1970 comic book has appreciated 10% per year and originally sold for $0.35. What will it be worth on 2010?

  37. chemistry

    The rate constants for a first order decay reaction are found to be: k287.3∘C=1 x 10−4 s−1 k327.4∘C=19.2 x 10−4 s−1 a) Determine the value, in s-1 of k250∘C (b) How long will it take, at 350 ∘C, for the reactant to decay to 1% of its

  38. Math

    Joshua wants to know if x−5 is a factor of the polynomial P(x)=x^3−5x^2−x+5. Joshua calculates P(5) and applies the Factor Theorem to conclude that x−5 is not a factor of P(x). Is Josh's conclusion that x−5 is not a factor correct? Why or why

  39. science

    Which is NOT a factor that affects fossilization? A) age of the organism B) hard or soft body parts C) predators destroying the body D) body decay due to natural elements

  40. chemistry

    a certain radioactive nuclide has a half life of 5.00 hour. Calcuate the decay rate for 1.000 mole of this nuclide __________ decay s-1

  41. mathematics

    what is the equation for exponetial decay(radioactive decay) and how to use the half life in the equation

  42. math

    a) A linear function f(t)=b + mt has a slope of -4 and vertical intercept of 20. Find its equation. b) An exponential function g(t)=Ca^t has a decay factor of 1/4 and an initial value of 20. Find its equation. Plot both functions

  43. precalc

    Three hours after taking a pain medication, 41% of the medication still remains in the bloodstream. Let m be the 1-hour decay factor. a. What is the 3-hour decay factor as a numeric value? What is the 3-hour decay factor in terms of m ? b. Use your results

  44. Algebra

    Identify and interpret the decay factor for each of the following. a.) P= 400×(0.43)^t decay factor: 0.43 This means that the function decays by ___?___ % b.) f(t)= 3800×(0.84)^t decay factor: 0.84 This means that the function decays by ___?___ % c.) y=

  45. math 115

    A city of population 2.0 million is expected to experience a 15% decrease in population every 10 years. a. What is the 10-year decay factor? What is the yearly decay factor? The yearly decay rate? b. Use part (a) to create an exponential population model

  46. chemistry

    Write a partial decay series for Po-214 undergoing the following sequential decays: á, â, á, â. Use e for an electron. Use the format +1 or -1 for charge. a)a decay b)â decay c)a decay d)â decay

  47. Algebra II

    I first want to make it clear that I have only taken Geometry, Algebra I, and pre-Algebra. That seemed to clear things up last time. Question: Matt bought a car at the cost of 25,000 dollars. This car's value goes down 15% every year. 1. What is the decay

  48. 8th grade

    Can you make a sentence that is not to hard to understand using the words growth factor, exponential form, and decay factor?

  49. Math Growth & Decay

    a) A growth factor of 1.22 corresponds to a rate of? b)a growth rate of 6.7% corresponds to a growth factor of? c)a decay factor pf 0.972 corresponds to a decay rate of? d)A decay rate of 12.3% corresponds to a decay factor of?

  50. chem

    a) Potassium-40 undergoes three different modes of radioactive decay (Beta decay, Positron decay, and Electron Capture decay). Write balanced nuclear reactions for each of these decay modes. Are the products stable (not radioactive)? b) Potassium-40 has a

  51. physics

    a radioactive sample has a decay rate R of 518 decay/min at time t=7 min and 156 decay/ min at time t=17 min. calculate the decay constant and the initial decay rate?

  52. Algebra

    What is the decay factor of 50% spending cut?

  53. Physic

    A radioactive element x has half life of 30 days and will decay to become another new element Y.. a) calculate decay constant b) how long it will take for 90% of the no.Of atom in radioisotope x to decay?

  54. Physic

    A radioactive element x has half life of 30 days and will decay to become another new element Y.. a) calculate decay constant b) how long it will take for 90% of the no.Of atom in radioisotope x to decay?

  55. Math *Updated*

    So I figured out how to do the first 6, how do I do the remaining? 7. Evaluate the function below over the domain {-1, 0, 1, 2}. As the values of the domain increase, do the values of the function increase or decrease? y = (3/4)ˣ 8. Suppose an investment

  56. Algebra

    ) Research the financial crisis in Greece and summarize it in one-two paragraphs. Note: Paragraphs consists of three complete sentences. This is an academic assignment where you need to use proper grammar (i.e., capitalization, punctuation, and no

  57. Algebra

    Research the financial crisis in Greece and summarize it in one-two paragraphs. Note: Paragraphs consists of three complete sentences. This is an academic assignment where you need to use proper grammar (i.e., capitalization, punctuation, and no

  58. Physics

    Is a small or large decay constant best for protection against gamma radiation? Hint: Calculate half thickness. Example: Decay constants for Pb, Al, water, and Fe are 0.77, 0.16, 107, and 0.44. Which is better for radiation shielding? The larger the decay

  59. Physics Help Please! Decay Questions

    archaeologist digging at the site of an ancient settlement discover the remains of a wooden structure. carbon 14 dating of the wood from the structure finds a decay rate of 180 decays/min. Knowing that the decay rate for living wood is 600 decays/min and

  60. Physics Help Please

    archaeologist digging at the site of an ancient settlement discover the remains of a wooden structure. carbon 14 dating of the wood from the structure finds a decay rate of 180 decays/min. Knowing that the decay rate for living wood is 600 decays/min and

  61. Math

    How would I do these? 6. The speed of sound is approximately 1.2 × 10³ km/h. How long does it take for sound to travel 7.2 × 10² km? Write your answer in minutes. 7. Evaluate the function below over the domain {-1, 0, 1, 2}. As the values of the domain

  62. Algebra

    How do I identify an exponential growth/decay function on a graph? I'm assuming that if the curve moves from left to right, upwards, it is growth, and if it moves left to right, downwards, then it is decay. Please tell me whether this reasoning is right or

  63. physics

    A building has become accidentally contaminated with radioactivity. THe longest lived material in the building is strontium-90 (atomic mass of 90 Sr 38 is 89.9077). If the building initially contained 5.0kg of this subtstance and the safe level is less

  64. Chemistry

    Write a nuclear equation for the following: Iodine 131 undergoes beta decay two times Plutonium 239 is an alpha emitter Th 234 undergoes beta decay once and then alpha decay How do I go about writing nuclear equations?

  65. Biology

    Help please! Do organic fertilizer products (in bags or sacks) decay after some time? If yes, how long will it take to decay?

  66. Algebra

    What are some real-life examples of exponential decay? Please help me think of some ideas...except radioactive decay.

  67. Linear Algebra

    whats the exponential decay equation for 100 atoms that decay 1/20 per day

  68. chemistry

    If the radiicativr decay of nuclear explosion contains 90 Sr , with a half life of 28.1 years how long will it take for 99 of this radioaioot to decay

  69. Chemistry - radioactivity

    Hello Dr.Bob, could you please help me with this problem: Which of the following nuclides are most likely to decay via beta decay? a)200 78 Pt b)192 78 Pt c)188 78 Pt d)196 78 Pt

  70. chemistry

    which of the following is consistent with the line spectrum of the hydrogen atom? one of the choices is the nucleus is udnergoing gamma decay. but this si not one of the answers. Im just wondering what kind of decay happens?

  71. Physics

    The factor "number of stars in the survey" should preferably be referred to as a / an A) Astronomical factor B) Biological factor C) Socio-technological factor D) Data Limitation factor

  72. chem

    Nuclide X has decay constant 1.08 h-1. It can decay in 2 branches, to nuclide Y or to nuclide Z: X --> Y, with decay constant 0.43 h-1, and X --> Z, with unknown decay constant. If there are 10 moles of nuclide X at time t = 0, how many moles of each

  73. science

    Suppose you are provided with 500 dice.calculate the number of throws that is equivalent to one half life and the decay constant for the process.under radioactivity decay analogue experiment.

  74. Math

    7. The value of a computer has a decay factor of 0.85 per year. After 2 years, the computer is worth $1445. What was the original value of the computer?

  75. Chemistry

    The rate constants for a first order decay reaction are found to be: K287.3C = 1 X 10-4s-1 K327.4C = 19.2 X 10-4s-1 (a) Determine the value, in s-1 of K250C (b) How long will it take, at 350C, for the reactant to decay to 1% of its original concentration?

  76. Chemistry

    The rate constants for a first order decay reaction are found to be: k287.3∘C=1 x 10−4 s−1 k327.4∘C=19.2 x 10−4 s−1 (a) Determine the value, in s-1 of k250∘C (b) How long will it take, at 350 ∘C, for the reactant to decay to 1% of its

  77. chemistry (urgent)

    can you tell me how the beta-plus decay process may be understood (i) at the level of individual nucleons and (ii) at the level of quarks, by writing a decay reaction in each case.

  78. physics

    if 5/6th of a radioactive sample decay in 70 years and 1/6th remain. how can you find the half life without knowing the decay constant can you help?

  79. chemistry

    can you tell me how the beta-plus decay process may be understood (i) at the level of individual nucleons and (ii) at the level of quarks, by writing a decay reaction in each case.

  80. Science

    Why does beta particle has different notation of nucleon number in spontaneous decay of tritium vs. beta decay of uranium 237?

  81. Astronomy

    Imagine that you are a particle physicist, and you have come up with a theory that some gamma-ray bursts come from the decay of a new and exotic sub-atomic particle that you think might exist. You calculated that if this particle really does exist and

  82. Physics ...

    Hi Radioactive decay - A radioactive nuclide has a decay constant of - 10^-6 s-1 what is its half life ? I have come up with is IN (2) / 0.000001 s-1 = 693147.18055 which i am having troube working into real figures Can anyone help please .. thanks

  83. Physics

    Hi Radioactive decay - A radioactive nuclide has a decay constant of - 10^-6 s-1 what is its half life ? I have come up with is IN (2) / 0.000001 s-1 = 693147.18055 which i am having troube working into real figures Can anyone help please .. thanks

  84. Chemistry

    There are several technological applications for the transuranium elements (Z > 92). An important one is in smoke detectors, which can use the decay of a tiny amount of americium-241 to neptunium-237. What subatomic particle is emitted from that decay

  85. Algebra 2

    The value of a car depreciates exponentially over time. you spend 20000 to purchase the car, and three years later, the car value is at 14580. What is the decay factor (B-value) of the car? Show work

  86. Math+Growth/Decay

    3e^2x = G -3e^2x = G -3e^-2x = D 1/8e^2x = G -1/8e^-2x = D Would that be correct? I just made these examples up in my head. How can you tell if its growth or decay? I just look at the exponents. If is a negative then its decay? if its positive then its

  87. math

    39mg radioactive with 1/2 life is decay total in 2.5 years. How many mg it remain if half of the amount is decay in 2 years? Thank you!

  88. Algebra

    Determine whether each function is an example of exponential growth or decay. Then find the y-intercept. a) y = 2(4)^x growth or decay y-intercept: b) y = 3(.25)^x growth or decay y-intercept:

  89. Chemistry

    There are several technological applications for the transuranium elements (Z > 92). An important one is in smoke detectors, which can use the decay of a tiny amount of americium-241 to neptunium-237. What subatomic particle is emitted from that decay

  90. Chemistry

    Pu-238 is radioactive by alpha-decay (half-life 87.7 y). Each decay releases 5.6 MeV of energy. Pu-238 is sometimes used to power space probes. If all the decay energy can be converted to electric power, what mass of Pu-238 would be required to power a 22

  91. chem

    Pu-238 is radioactive by alpha-decay (half-life 87.7 y). Each decay releases 5.6 MeV of energy. Pu-238 is sometimes used to power space probes. If all the decay energy can be converted to electric power, what mass of Pu-238 would be required to power a 22

  92. itc c++

    can any one please dry run this code #include using namespace std; int main() { intnum,factor=1,temp; cout1) { factor = factor/10; cout

  93. MATH

    Factor by identifying a common factor in each term. g) 6xy2 = (3x) (?) h) 25a3b2 = (5a2b2) (?) i) 6x + 6y + 6p Factor: j) x(x+2) + y (x + 2) - 5(x + 2) k) 5y2 - 10y3 l) ax + ay + az Factor: m) yx(y+1) + 4x(y + 1) - 5(y + 1) n) 6p2 - 3p3 o) 4x4 + 2x Please

  94. Geology

    Does this sound right? Describe your assigned method and how it is used to evaluate geologic time. My assigned method was Absolute Dating / Numerical Age. Absolute Dating / Numerical Age is the process that assigns a numerical age ( this tells how old a

  95. DrBob222

    On Monday you helped me to understand and answer the one question, but I am not too sure if they want all the calculations that you answered... regretably, I am still a bit lost with these! Below is the question as it is printed: The isotope caesium-137,

  96. math

    If the sides of a box all double in length, by how much does its volume increase? By a factor of 2 By a factor of 4 By a factor of 6 By a factor of 8 Explain your answer.

  97. Algebra

    What is the exponential growth or decay. Of this function and the constant percentage? 20(.876)^x Would the percentage be expressed a decimal? I know it is decay ,so would you just add a negative to whatever percentage you get?

  98. Chemistry

    Radioactive decay is first order in the decaying isotope. For example, strontium-90 contained in fallout from nuclear explosions decays to yttrium-90 and a beta particle. Write the rate law for the decay of strontium-90. Can you please take me step by stem

  99. physics

    if 15/16 of 12 atom an element decay in 8minutes. find the decay constant of the element.

  100. Physics

    A first order exponential decay can be written as A(t)= Ae^(-t/r) where A(t) is the amount (of substance) after time t, A is the initial amount at time t=0 and r is the decay time. The fall time is defined as the time in which A(t) falls from 90% to 10% of

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