College: Chemistry

posted by .

Hi there, I need help on my homework for chemistry and I do not understand the step on how to work this problem out. Please help me with this problem:

On a Sunday morning while having your breakfast you determine that you need about 2.95X10^(5)J to heat water for your tea in the microwave. If 2.5X10^(24) photons hit the cup every second and you set the timer to 2.4 min, what should the frequency of the microwave be so that the tea is ready in that time?

  • College: Chemistry -

    •Convert the minutes to seconds.
    •Multiply (photons/sec) by number of seconds to get the total number of photons.
    •Divide total joules by numer of photons to get the energy of a photon.
    • E(photon) = h*f (f = freq.)
    Substitute E and h into the above formula and solve for f.

  • College: Chemistry -

    2.4 min x (60s/1min) x 2.5 x 10^24 photons/s = 3.6 x 10^26 photons
    energy per photon = 2.95 x 10^5 J/3.6 x 10^26 photon = 8.2 x 10^-22 J/photon

    Now, E = hf
    f = E/h
    f = 8.2 x 10^-22 J/6.626 x 10^-34 J.s
    f = 1.2 x 10^12 s^-1

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Algebra

    How do I work this problem, it is not a homework problem but a problem similar to a homework problem. I know i need to factor the left side of the problem. here is what I have so far.. x^2-2x+1=7 x^2-2x+1-7=7-7 x^2-2x-6=0 here is where …
  2. Algenra

    How do I work this problem, it is not a homework problem but a problem similar to a homework problem. I know i need to factor the left side of the problem. here is what I have so far.. x^2-2x+1=7 x^2-2x+1-7=7-7 x^2-2x-6=0 here is where …
  3. college: Chemistry

    I need help on this homework problem and I do not understand how to work on it. Please help me with this problem. The photoelectric work function of a metal is the minimum energy needed to eject an electron by irradiating the metal …
  4. college-- chemistry

    I am having a problem with this problem from my homework. I need some help on this problem. Microwave ovens work by irradiating food with microwave radiation, which is absorbed and converted into heat. Assume radiation with wavelength=15.0cm …
  5. Math subject Calculus

    Hi there I am having some difficulties to solve this problem from my homework package and i don't understand how to approach this problem. Please help me by giving me advice on how to approach this problem. Let z = xsin(x/y), y does …
  6. 5th grade math

    I need help with this problem ! 5 2/5 - 3 4/5= ?
  7. Chemistry

    My teacher gave us the answer to a chemistry problem and i cannot figure out how she got the answer. Can you help me work out this problem so i can better understand it. A gas under an initial pressure of 0.60atm is compressed at a …
  8. chemistry

    This question I really don't get it. I tried tried tried to figure out how to start solve the problem but still couldn't figure out. So can you help me with one question PLEASE?
  9. Chemistry

    What volume would be occupied at 0°C and 1 atm by 3 mol CO₂(g)?
  10. Math 4th grade

    I need help on how to work this problem out. I need step by step please. This is the word problem: On Monday, I rode 9 miles. On Sunday, I rode 4 fewer days than on Monday. On Tuesday I rode 2 times farther than Sunday. How far did …

More Similar Questions