1. Physics

    A bothersome feature of many physical measurements is the presence of a background signal (commonly called "noise"). It is necessary, therefore, to subtract off this background level from the data to obtain a valid measurement. Suppose the measured
  2. physics

    A bothersome feature of many physical measurements is the presence of a background signal (commonly called "noise"). In Part 2.2.4 of the experiment, some light that reflects off the apparatus or from neighboring stations strikes the photometer even when
  3. chemistry

    What type of feature will be observed in the EI mass spectrum of chlorobenzene? An absorption at 3100 cm–1 No signal at all A signal at 112 and a signal at 114 in a ratio of 3:1 A signal at 112 and a signal at 114 in a ratio of 1:1
  4. Physics

    In the experiment, a meter is hooked up to a speaker to monitor the amplitude of the received sound. Suppose the background signal level is 15 mV, the signal is 90 mV with no attenuator and is 30 mV with an attenuator in place. Calculate pt/pi including
  5. Physics

    In the experiment, a meter is hooked up to a speaker to monitor the amplitude of the received sound. Suppose the background signal level is 15 mV, the signal is 90 mV with no attenuator and is 30 mV with an attenuator in place. Calculate pt/pi including
  6. Chemistry

    Why wasn't information about the mass of isotopes sufficient for identifying the isotopes? Provide an example to explain the answer. Figure 2 shows 2.5 min averaged spectra of ambient aerosol at nominal m/z 208 obtained with the HR-AMS located at T0. Panel
  7. physical science

    How many hours are required for a radio signal from a space probe near the dwarf planet Pluto, 6.00 x 10 (to the 9th) km away, to reach Earth? Assume that the radio signal travels at the speed of light, 3.00 10 (to the 8th) m/s.
  8. astronomy

    on a domestic gas cooker the temperture in the hottest part of the flame is about 2200k.if salty eater is spilled in the flame then it becomes yellow-orange.measurements with a spectrometer show the presence of an emission line at 589n. 1) the solar
  9. World Geography

    1.The physical feature of Western Europe where most major cities are found is called A. the plains. B. the glacier.<<<<<<< C. the tundra. D. the taiga 2.The Magna Carta was the first step toward England’s ______________. A. large
  10. self regulated volume control

    Hey what's up... does anyone know what does ''self regulated volume control'' mean? I suspect this is what is more commonly called AGC, or automatic gain control. This self regulating amplifer stage compensates for incoming signal strength (stronger input
  11. Social studies

    13.the physical feature of western europe where most major cities are found is called A.the plains (MY ANSWER) B.the glacier C.the tundra D.the taiga 14.what made the rhine river one of europes most polluted rivers? A.urbanization B.loess C.industrial
  12. earth

    #37 whenever scientist carefully measure any quantity many times they expect that: a. all the measurements will be exactly the same b. only two of the measurements will be exactly the same c. all but one of the measurements will be exactly the same d. the
  13. justice

    No clue where to start with this...if someone can just help me setup these problems or assist in any way that would be great. 1. d=2.507 g/1.22 mL = 2.054918033 g mL^-1 explain how both the rules for significant figures and the random error calculation
  14. chemistry

    No clue where to start with this...if someone can just help me setup these problems or assist in any way that would be great. 1. d=2.507 g/1.22 mL = 2.054918033 g mL^-1 explain how both the rules for significant figures and the random error calculation
  15. Geography

    which of the following is an example of a physical feature on earths surface? a) Golden Gate Bridge b) Grand Canyon c) San Diego Zoo d) Sea World Physical features are not man-made. What do you think the answer is?
  16. geology

    Create a 12- to 15 slide Microsoft® PowerPoint® presentation for your chosen geologic feature. Address the following: · Describe the various geologic events that have occurred in the region around your feature. · Describe the geological features and
  17. English (Check)

    After reading each passage, write the signal word or words it contains and the type of relationship that each signal word indicates. 1. They entreated us not to be angry any longer, because, even if it was their death, they would take us where we chose. A:
  18. Biology

    true or false if an organism randomly develops a feature that gives it a survival advantage, then it will be more likely to survive than other organisms, and will also be more likely to produce offspring which also have this advantageous feature.
  19. Physical Education

    I have to da a 10 page paper on Integration of health and physical education in curriculum. I need help finding 10 journal articles that are peer-reviewed, current trends and political background. Help please???
  20. Digital Signal Processing

    A signal of power 6 mW is transmitted through a cable. If the signal encounters a loss of 6db due to impairments of the transmission medium. Calculate the power received at the receiver end.
  21. physics

    The driver of a train traveling at 30 m/s applies the brakes when he passes an amber signal. The next signal is 1.5 km/h down the track and it reaches 75 seconds later. Assuming uniform acceleration, find the velocity of the train at the second signal.
  22. Chemistry

    I'm going over some post-laboratory questions for Conductivity of Solutions. One of the questions is... From your measurements, what can you say about a) the presence of ionic impurities in tap water? b) the presence of molecular impurities in tap water? I
  23. SCIENCE :(

    What is a Unique physical feature of a Canyon???? Thanks!!! :)
  24. Geography

    Is a marsh copse a physical feature?
  25. Algebra

    Calculate the relative error to the nearest tenth, compared to the actual measurements, given the following swimming pool measurements: Mr. Joe's measurements: 35ft x 17.5ft Actual measurements: 35ft x 22.75ft (A) 0.1 (B) 0.2 (C) 0.3 (D) 0.4 I got choice
  26. Physical Education

    What are the measurements of field hockey stick and ball? What are the names of 4 International hockey Players? What is IFWHF and FIH? What are Social, Mental and Physical Well-being? Describe Endomorph,Ectomorph and Mesomorph What is Health?
  27. engineering

    Let’s suppose the message x(t) is an analog signal shown in the figure below. a) Draw the block diagrams of the system which converts the analog message signal x(t) to a pulse modulated signal. b) Draw the sampled signal with the sampling frequency
  28. Mathematics

    A motor car travels 175 km distance from a place A to B,at a uniform speed 70km/hr passes though all ten green traffic signals.Due to heavy traffic it stops for 1 minute at first signal,3 minute at second signal,5 minute at third signal and so on stops for
  29. Physics

    Could you please check my answers and help me with some? 1. What does it mean to say a physical quantity is conserved? Why is this idea useful? (I don't understand how it is useful) -When a physical quantity is conserved it means that it doesn’t change.
  30. health

    What is the larynx commonly called?
  31. math

    A radio station's signal has a radius of 100 miles. If you drive at a constant speed of 40 miles an hour, nonstop, directly across the diameter of the signal, how long can you listen to the station before the signal fades?
  32. SCIENCE HELP ASAP ONLY ONE QUESTION!!!!!!!!!!!!!!!

    which of the following is an example of corporate behavior A) a lion hunting a zebra B) Two male peacocks fighting over a female peacock C) A hyena stealing a cheeta's kill D) a bluejay calling to signal the presence of a hawk
  33. Biology

    Select two signal mechanisms that activate transcription in response to an external signal. Any of these systems ultimately activates a transcription factor. For each of the systems you have selected, trace the route from signal binding to receptor to the
  34. 10th grade Math

    A radio station's signal has a radius of 100 miles. If you drive at a constant speed of 40 miles an hour, nonstop, directly across the diameter of the signal, how long can you listen to the station before the signal fades?
  35. Geography

    Near which type of physical geographic feature were the first farming villages built?
  36. 6th geo

    a prominent physical feature along the west coast of england is th
  37. physical science

    Which of the following statements is NOT true? A. You are exposed to nuclear radiation every day. B. Most of the nuclear radiation you are exposed to occurs naturally in the environment. C. Naturally occurring nuclear radiation is called background
  38. College Algebra

    Problem: In certain signal detection problems (e.g. radar or sonar) the probability of false alarm (FA) (i.e., of saying that a certain signal is present in the data when it actually is not) is given by: ∞ pFA = ∫ _______1_______ x^p/2-1 e-x/2
  39. science help

    which of the following is an example of cooperative behavior? A.a lion hunting a zebra B.two male peacock fighting over a female peacock**** C.a hyena stealing a cheetah's kill D.a blue jay calling to signal the presence of a hawk.
  40. social studies

    Near which type of physical feature was most of the earliest farming villages built?
  41. social studies

    What physical feature is in Africa that is located in the north and separates it from Europe?
  42. Social Studies

    Near what type of physical feature was most of the earliest farming villages built?
  43. social studies

    What physical feature in Africa is located in the northeast and separates it from Asia?
  44. calculus

    In electrical engineering, a continuous function like f(t)=sin(t), where t is in seconds, is referred to as an analog signal. To digitize the signal, we sample f(t) every ∆t seconds to form the sequence Sn= f(n∆t). For example, sampling f every 1/10
  45. math

    Taking the speed of the radio signal as 3×108 m/s, calculate the time taken for a signal to reach a GPS receiver from a GPS satellite at a position 21 000 km distant from the receiver. Assume that the speed of the signal is unchanged over the whole path
  46. Statistics

    A sample of 12 measurements has a mean of 37 and a standard deviation of 4.25. Suppose that the sample is enlarged to 14 measurements, by including two additional measurements having a common value of 37 each. A. Find the mean of the sample of 14
  47. medical electronics

    Autocorrelation matrix of input signal (noise-corrupted signal) x(n), Φxx is [Note: Φd and Φm are autocorrelation matrix of desired signal and noise, respectively] Φd∗Φm Φd+Φm Φd−Φm Φd/Φm
  48. English

    I find it difficult to check these sentences since the punctuation is missing, the word choice is unclear and they contain grammar mistakes! I really hope you can help me. I think we need to simplify the sentences. 1) Mary Shelley's Frankenstein, unlike
  49. statistics

    A sample of 12 measurements has a mean of 34 and a standard deviation of 4.5. Suppose that the sample is enlarged to 14 measurements, by including two additional measurements having a common value of 34 each. A. Find the mean of the sample of 14
  50. Math

    A signal is transmitted over a noisy channel. It is known that the signal will be correctly received with probability 0.797. If 3 copies of the signal are independently sent over this channel, what is the probability that at least one of them is received
  51. Statistics

    A signal is transmitted over a noisy channel. It is known that the signal will be correctly received with probability 0.797. If 3 copies of the signal are independently sent over this channel, what is the probability that at least one of them is received
  52. physical science

    Approximately how long would it take a radio signal to reach the International Space Station (ISS) at an orbital altitude of 350km?
  53. social studies

    Which physical feature covers most of Arabia? empty quarter>>> fertile crescent zagros mountains Persian gulf
  54. history

    during the colonial 1580-1776 which physical feature presented the greatest obstacle to colo nists who wanted to move westward
  55. L.A or C.A

    Hello everyone! I have a question about feature articles... How is it suppose to look like? Can you find me a feature article on anything so I can see the formate? well thank you! =)
  56. Health

    What is the trachea commonly called? A. Voice box B. Vocal cord C. Windflute D. Windpipe A? i don't get this please HELP ME!!!
  57. Physics

    In TV picture, faint, slightly offset ghost images are formed when the signal from the transmitter travels to the receiver both directly and indirectly after reflection from a building or some other large metallic mass. In a 25 inch set, the ghost is about
  58. physics

    A radio receiver is set up on a mast in the middle of a calm lake to track the radio signal from a satellite orbiting the Earth. As the satellite rises above the horizon, the intensity of the signal varies periodically. The intensity is at a maximum when
  59. physics

    A radio receiver is set up on a mast in the middle of a calm lake to track the radio signal from a satellite orbiting the Earth. As the satellite rises above the horizon, the intensity of the signal varies periodically. The intensity is at a maximum when
  60. Physics

    A radio receiver is set up on a mast in the middle of a calm lake to track the radio signal from a satellite orbiting the Earth. As the satellite rises above the horizon, the intensity of the signal varies periodically. The intensity is at a maximum when
  61. discipline

    When Pat talks during math instruction, Mrs. Miller puts Pat's name on the board. If Pat interrupts the lesson again, she will receive a check by her name and lose five minutes of recess. What type of discipline is this called? Is it assertive discipline?
  62. Science

    What physical process is being observed using spectroscopic measurements in Beer's Law experiment?
  63. statistics...Please help

    A sample of 12 measurements has a mean of 24 and a standard deviation of 4.5. Suppose that the sample is enlarged to 14 measurements, by including two additional measurements having a common value of 24 each. Find the standard deviation of the sample of 14
  64. Statistics

    A sample of 12 measurements has a mean of 24 and a standard deviation of 4.5. Suppose that the sample is enlarged to 14 measurements, by including two additional measurements having a common value of 24 each. Find the standard deviation of the sample of 14
  65. statistics

    A sample of 12 measurements has a mean of 20 and a standard deviation of 2. Suppose that the sample is enlarged to 14 measurements, by including two additional measurements having a common value of 20 each. Find the standard deviation of the sample of 14
  66. Social Studies

    Which physical feature covers most of Saudi Arabia? the Empty Quarter the Fertile Crescent the Zagros Mountains the Persian Gulf
  67. social studies

    witch physical feature covers most of arabia? a.the empty quarter b.the fertile crescent c.the zagros mountains d.the persian gulf
  68. information technology

    discuss the following wireless transmittion medium:satillite signal microwave link infrared signal
  69. health

    Which approach is commonly used to treat eating disorders? A. Electroshock therapy B. Nutritional counseling C. Physical fitness D. None of the above b?
  70. physics

    . A sonar signal is sent from a ship and the signal returns from the bottom 3.65 s later. How deep is the ocean if the speed of sound in water is 1,530 m/s?
  71. information technology

    discuss the following wireless transmittion medium: 1.satillite signal 2.micro wase link 3.infrared signal
  72. 7th grade science

    1. How many chromosomes do human sex cells have? (1 point) 22 43 46 23 2. The actual genetic makeup of an organism for a particular trait is called the ______. The physical characteristic that trait gives the organisms is called the ______. (1 point)
  73. Energy Science

    ___ can convert sound waves to an electrical signal that can be converted to radio waves, microwaves, or light waves. Receiver convert the tramsmission back into electric signal, and the speaker changes the electric signal into a ___ wave
  74. feature writing

    what is a feature article and give examples
  75. English

    1. He called to her and offered his seat to her. 2. He called out to her and offered his seat to her. 3. He called her and offered his seat to her. --------------------------- Are they all the same in meaning? Which one is commonly used?
  76. 7th grade science ASAP

    1. How many chromosomes do human sex cells have? (1 point) 22 43 46 23 2. The actual genetic makeup of an organism for a particular trait is called the ______. The physical characteristic that trait gives the organisms is called the ______. (1 point)
  77. college

    Communication channels - physical presence, written-printed, electronic/computer what are the advantages and disadvantages of each?
  78. Social Studies

    Which physical feature covers most of arabia? A) The Empty Quarter?** B) The Fertile Crescent? C) The Zagros Mountains? D) The Persian Golf? i think it might be A? but I'm not sure, if you could just check this out that'd be great =)
  79. English

    Signal Phrase: Read "Too Much Pressure" by Colleen Wenke (564-568). Consider it a model for using signal phrases to introduce quoted material as explained on pages 508-512 of the Bedford Handbook. 1. Copy two good examples from Wenke's essay of signal
  80. PreCalc

    The decibel (dB) is defined as dB= 10log (P2/P1), where P2 is the power of a particular signal. P1 is the power of some reference signal. In the case of sounds, the reference signal is a sound level that is just barely audible.How many dBs does a sound
  81. Criminal Justic

    What is commonly called transfer evidence? hairs and fibers heel imprints weapons blood stains
  82. physical chemistry

    This question is about a lab called Heats of Ionic Reaction in my Physical Chemistry class. I need to know why there should be a large percentage error in deltaH4
  83. Geology

    What does it mean to discove a popular geographic feature in my region. Could someone give me some examples of what I should be looking for? The question goes on to ask what major rock type does the feature consist of... I'm confused, please help
  84. Physical science

    flammability is a material’s ability to burn in the presence of? A)hydrogen B)nitrogen C)oxygen D)carbon dioxide I think the answer is A am i right?
  85. physics

    An FM radio station broadcasts its signal at a frequency of 9.15 ×107 hertz. Determine the wavelength of the signal in air. Round your answer to the nearest hundredth of a meter.
  86. Chemistry

    Propane gas (C3H8) burns completely in the presence of oxygen gas (O2) to yield carbon dioxide gas (CO2) and water vapor (H2O). Write a balanced equation for this reaction. Assuming that all volume measurements occur at the same temperature and pressure,
  87. Chemistry

    Propane gas (C3H8) burns completely in the presence of oxygen gas (O2) to yield carbon dioxide gas (CO2) and water vapor (H2O). Write a balanced equation for this reaction. Assuming that all volume measurements occur at the same temperature and pressure,
  88. Statistics

    A sample of 12 measurements has a mean of 34 and a standard deviation of 4.5. Suppose that the sample is enlarged to 14 measurements, by including two additional measurements having a common value of 34 each. A. Find the mean of the sample of 14
  89. math

    A radio station broadcasts a signal over an area with radius of 50 miles. The station can relay the signal and broadcast over an area with a radius of 75 miles. How much greater is the area of broadcast region when the signal is relayed? Round your answer
  90. English

    1. He gave us a signal to move forward. -------------------------------------- What is the relationship between 'signal' and 'to move forward'? Are they in apposition? Or does 'to move forward' modify 'signal'?
  91. physics

    A state trooper’s car sends out a radar signal at a frequency of 13.3 GHz. Find the wavelength of this signal. The wave speed is 2.998 × 108 m/s. Answer in units of m
  92. science

    the neuron that transmit the signal to your foot to kick a soccer ball are called reflexes motor neurons sensory neurons interneurons
  93. science

    the neuron that transmit the signal to your foot to kick a soccer ball are called reflexes motor neurons sensory neurons interneurons
  94. organic chem

    One characteristic of monomers that form addition polymers that is not common in monomers which form condensation polymers is: a. the presence of alkyl side chains b. the presence of two functional groups. c. the presence of pi bonds. d. None of the above.
  95. computer

    hi on my computer, i put a background on the desktop. i didn't like that one so i got another background but how do i get rid of the old one. because everytime i log on using my log in name, the picture of the old picture pops up and then my new background
  96. Geophysics

    A continuous signal is sampled at regular intervals, every 10 ms. What is the maximum frequency that can be captured by this sampling process without incurring any distortion of the original signal? If the original signal contains noise at a frequency of
  97. action potentials

    this is in regards to action potentials. they do not affect the membrane potential of neurons. they increase in magnitude as they travel along an axon. they can be measured by using electodes. there is a loss in signal as they travel along an axon. just
  98. ART

    how does a landscape artists make an object in the foreground appear closer than an object in the background? a~by making the object in the foreground larger in comparison the background objects. b~by making the object in the foreground less detailed in
  99. Physical Science

    a vacum tube can be used to change alternating current into direct current increase the strength of a signal turn a current on or off all of the above
  100. History

    What physical feature especially attracted European colonists? A.Many offshore islands B.Fertile soil along high mountain cliffs C.Natural harbors along Atlantic Ocean D.Large lakes located along the coastline