posted by .

Suppose that absorbances of several solutions were measured at 545 nm. What is the frequency of this wavelength? What is the energy of this wavelength? (h=6.626 times 10^-34J*S)

  • Chemistry -

    c = freq x wavelength.
    c = 3E8 m/s
    freq = ? in Hz.
    wavelength = 545 nm x 10^-9 m

    For E in J = hc/wavelength.

  • Chemistry -

    What is the freq? You got C=2x10^8m/s but you don't have the freq.

  • Chemistry Someone Check for me -

    What did you use for the freq?

  • Chemistry -

    Isn't the problem asking for frequency? You use c = f*w to solve for f.
    And I don't see anywhere that I have 2E8 m/s.
    c = f*w
    3E8 = f*545E-9
    Solve for f.

  • Chemistry -

    Is F=5.55*10^14Hz?

  • Chemistry -

    close. I obtained 5.504E14 Hz which I would round to 5.50E14 Hz to three significant figures..

  • Chemistry -

    For the energy is it around 3.647x10^-19J? And how did you know that c=3*10^8m/s?

  • Chemistry -

    c is the speed of light. Look in your text for a table of physical constants and you will find the speed of light as 299,792,458 m/s which most of us round to 3E8 m/s most of the time.
    I found E to be the same number you have.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. science

    what is the wavelength of radiation with a frequency of 1.50 times 10^13s-1?
  2. Chemistry

    Under the correct conditions, the element molybdenum emits X-rays with a characteristic wavelength of 0.711A (7.11*10^-11m). These X-rays are used in diffraction experiments to determine molecular structures. How fast does an electron …
  3. Physics

    If a metal with a threhold frequency of 1.1 x 10^15 Hz is illuminated by light with a wavelength of 170 nm, then the maximum kinetic energy of the emitted photoelectron will be?
  4. Physics

    I need help solving this please! I think that for part (b) I can use energy and wavelength to solve for frequency and the one with the highest frequency is the most damaging, but I'm not sure what to do for part (a). You want to study …
  5. Chemistry

    The ionization energy of hydrogen is 1313 kJ/mol. Covert this energy to: wavelength (nm) 1/wavelength, reciprocal wavelength (cm^-1) spectral region?
  6. Physics

    Which of the following statements correctly describes the changes that occur in a sound wave, as it passes from cool air into warmer air?
  7. Chemistry

    E=hv E=energy h= Planck's constant =6.626 x 10^-34 v= frequency 1. What is the energy of light having a frequency of 2.28 x 10^12?
  8. Science

    Which of the following correctly describes a radio wave?
  9. Physics

    A circuit employs a silicon solar cell to detect flashes of light lasting 0.25 s. The smallest current the circuit can detect reliably is 0.32 μA . Assuming that all photons reaching the solar cell give their energy to a charge …
  10. Chemistry

    Can someone please help? How much total energy is emitted from a collection of 2.50 moles of H atoms if each atom is emitting a photon with a wavelength of 96.7 nm?

More Similar Questions