Photons

Modern halogen light bulbs allow their filaments to operate at a higher temperature than the filaments in standard incandescent bulbs. Assume that you have a standard light bulb with a filament operating at 2950 K, and a halogen light bulb with a filament operating at 3400 K. (a) Calculate the ratio of peak frequencies. ( fhalogen / fstandard ) (b) The human eye is most sensitive to a frequency around 5.5 1014 Hz. Determine the peak frequency of each bulb. i. halogen bulb ii. standard bulb I don't understand how I am supposed to solve this - I don't really understand the Wien's Displacement law, which I think I am supposed to use.

Photons

Two beams of light with different wavelengths (A > B) are used to produce photoelectrons from a given metal surface. (b) Find Kmax for cesium (W0 = 1.9 eV) if A = 570 nm, and B = 330 nm. Kmax, A ___ eV Kmax, B ___ eV I've tried using the KEmax equation where Kmax = hf - W0, but I got the wrongs answers. I don't know what I am doing wrong.

Photons

A green photon (wavelength = 570 nm) is absorbed by a free hydrogen atom, initially at rest. What is the recoil speed of the hydrogen atom after absorbing the photon? ___ m/s I just don't understand quantum mechanics - this problem seems simple, but I just don't understand how to do it.

Photoelectric effect

(See attached file for full problem description) --- In a photoelectric experiment on the metal copper, the following values of the stopping potential... ---

Photoelectric effect

Infrared photons cause a particular piece of metal to emit photoelectrons. Will photoelectrons be emitted when the metal is illuminated by visible light? If not, why? If yes, what properties of the emitted photoelectrons will be different from the case of the infrared illumination?