Exam 37: Quanta of Light

The radiation of a reference blackbody peaks at a frequency of $500 \times 10 ^ { 15 }$ Hz. If a second blackbody has a peak radiation at half that frequency, its temperature is (compared to that of the reference body)

The reason the wavelike nature of a moving football is not noticed in everyday life is that

When light of wavelength 250 nm is incident on a metal surface, the stopping potential of the photoelectrons is 1.00 eV. The threshold frequency for the metal surface is

A 0.100-nm photon collides with a stationary electron. After the collision, the photon recoils backward and the electron moves forward. The electron's momentum is

An electron is accelerated by a potential difference of 20 V. The change in the electron's kinetic energy is

The color in the visible spectrum associated with the lowest temperature is

The Heisenberg uncertainty relations restrict the precision of simultaneous knowledge of the x component of a photon's position and its

The Compton wavelength is the wavelength of

Wien's Law relates the

An isolated aluminum (work function 4.08 eV) sphere of radius 7.00 cm, initially uncharged, is illuminated by ultraviolet light of wavelength 200 nm. The charge induced on the sphere is

A surface is illuminated by light and emits photoelectrons. The intercept (value corresponding to the place where the curve intersects the y axis) of the graph of the maximum kinetic energy of the ejected photoelectrons as a function of the frequency of the incident light is

The "stopping potential" associated with the photoelectric effect is the electric potential necessary to stop

If the wavelength of a photon is known very precisely, then so is each of the following except its

Max Planck postulated that the atoms comprising a cavity could resonate only

Classically, when electromagnetic radiation strikes an electron, we expect that

The kinetic energy of a photoelectron depends on the

X-rays of wavelength 0.400000 nm are scattered from a material. The wavelength of the X-rays scattered at an angle of 45^o to the incident beam is

When the accelerating voltage in an X-ray tube is doubled, the minimum wavelength of the X-rays

The photoelectric effect is explainable assuming

The temperature of your body is 35^oC. An estimate of the power emitted by your body (assumed blackbody) is