Frequency and Energy Problems

Frequency and Energy Problems

E = hn      h= 6.626 x 10^-34 J/Hz          1Hz = 1/s

1)  What is the energy of a photon whose frequency is 3.0 X 10¹² Hz?

2)  Calculate n for a l = 700 nm. n = c/l nm = nanometers
     Calculate n for a l = 400 nm. n = c/l nm = nanometers
     Calculate the energy for each wavelength.
     Which wavelength has the greatest frequency? Which wavelength has more energy?

3)  A red light has a wavelength of 728 nm. 
     What is the frequency of the light?
     What is the speed of the wave in m/s?

4) A purple light has a frequency of 7.42 x 10¹⁴ Hz. 
    What is its wavelength?
    What is the energy of one quanta of light.

5) You broke your big toe!  The x ray they take of  toe uses waves that have a length 
     2.19 x 10¹⁰m.
     What is the speed of the wave in m/s?
     What is the wavelength in nm?
      What is the frequency of the x ray?