Exam 30: Quantum Physics

A 140. KeV photon strikes an electron and scatters through an angle of 120.° (a) What is the wavelength of the photon before scattering? (b) What is the photon wavelength after scattering?

A blackbody is a perfect emitter of the radiation it generates.

What is the momentum of a photon of light that has a wavelength of 480 nm?

The minimum amount of energy necessary to eject an electron from a metal surface is referred as Planck's constant.

Which one of the following is true for the surface temperature of a bluish-white star in a constellation as compared to the red star in the same constellation?

If in Compton scattering of X-rays from a metal, the wavelength increases by 5% at an angle of 60°, what was the original wavelength before scattering?

At what rate are photons emitted by a 50. W sodium vapor lamp? (Assume that the lamp's light is monochromatic and of wavelength 589. nm.)

A certain photon after being scattered from a free electron at rest moves at an angle of 120° with respect to the incident direction. If the wavelength of the incident photon is 0.591 nm, what is the energy of the scattered photon?

A beam of light with a frequency range of 3.01 × 10¹⁴ Hz - 6.10 × 10¹⁴ Hz is incident on a metal surface. If the work function of the metal surface is 2.20 eV, what is the maximum kinetic energy of photoelectrons ejected from this surface?

In the spectrum of white light which one of the following colors corresponds to the lowest temperature?

What is the number of photons per second given off by a light bulb with a power of 100 Watts operating at an efficiency of 4.80%? Assume the wavelength of light to be 600 nm.

The human eye can just detect green light of wavelength 500. nm, which arrives at the retina at the rate of 2 × W. How many photons arrive each second?

What would be the deBroglie wavelength for 1 gram moving at "escape speed" 25,000. mph?

You perform Compton scattering experiments with X-rays of a fixed wavelength. In one experiment you scatter the X-rays from free electrons. In the second experiment you scatter the X-rays from protons instead. For X-rays scattered under a given angle, the wavelength change

An electron is moving with speed 21. m/s. (a) What is its deBroglie wavelength? (b) What Diffraction Grating spacing between slits would give a 1st order maximum at 30.0°?

The wavelength of a light beam is doubled. Which one of the following is correct for the momentum of photons for that light beam?

Our bodies, at 37.°C, emit radiation which peaks at what wavelength?

Light of a given wavelength is used to illuminate the surface of a metal, however, no photoelectrons are emitted. In order to cause electrons to be ejected from the surface of this metal you should

Light with a frequency of 8.70 × 10¹⁴ Hz is incident on a metal that has a work function of 2.8 eV. What is the maximum kinetic energy that a photoelectron ejected in this process can have?

In the scattering of a photon striking an electron at rest, the energy of the incident photon is equal to the energy of scattered photon minus the final kinetic energy of the electron.