### Wavelength Calculation

Posted:

**Tue Oct 23, 2018 7:00 pm**The velocity of an electron that is emitted from a metallic surface by a photon is 3.6 x 10^3 km/s . (a) What is the wavelength of the ejected electron? (b) No electrons are emitted from the surface of the metal until the frequency of the radiation reaches 2.50 x 10^16 Hz. How much energy is required to remove the electron from the metal surface? (c) What is the wavelength of the radiation that caused photoejection of the electron? (d) What kind of electromagnetic radiation was used?

I understand how to do parts a and b, but I am confused on part c. I used the frequency given to us and substituted it into the equation c= (frequency x wavelength). The correct answer should be 8.8 nm but I got 12 nm. Am I supposed to use a different equation to calculate the wavelength?

I understand how to do parts a and b, but I am confused on part c. I used the frequency given to us and substituted it into the equation c= (frequency x wavelength). The correct answer should be 8.8 nm but I got 12 nm. Am I supposed to use a different equation to calculate the wavelength?