Problem 6.(adsbygoogle = window.adsbygoogle || []).push({});

Radiation emitted from human skin reaches its peak at wavelength=960um.

How much energy is carried by one quantum of these electromagnetic waves? Answer in eV.

I have found that the frequency is 3.125*10^11 Hz.

Note: What do I do?

Problem 8. Light of wavelength 350 nm falls on a potassium surface, and the photoelectrons have a maximum kinetic energy of 1.3 eV.

What is the work function of potassium? Answer in eV.

Problem 17.

Light of wavelength 3*10^-7 m shines on the metal lithium, iron , and mercury which have work functions of 2.3 eV, 3.9 eV, and 4.5eV, respectively.

For those metals that do exhibit the photoelectric effect, what is the maximum energy of the photoelectrons?

where do I start? :happy:

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: How much energy is carried by one quantum of these electromagnetic waves?

**Physics Forums | Science Articles, Homework Help, Discussion**