Questions from College Physics

Q: Use the photon model to explain why ultraviolet radiation can be harmful

Use the photon model to explain why ultraviolet radiation can be harmful to your skin, but visible light is not.

Q: Explain why the annihilation of an electron and a positron creates a

Explain why the annihilation of an electron and a positron creates a pair of photons rather than a single photon.

Q: Consider the situation described in Problem 18. (a)

Consider the situation described in Problem 18. (a) Take into account the expansion of the glass and calculate how much water will spill out of the glass. Compare your answer with the case where the...

Q: In a photoelectric effect experiment, two different metals (1 and

In a photoelectric effect experiment, two different metals (1 and 2) are subjected to EM radiation. Metal 1 produces photoelectrons for both red and blue light; metal 2 produces photoelectrons for blu...

Q: Rhodopsin is the molecule responsible for the reception of light in the

Rhodopsin is the molecule responsible for the reception of light in the rod cells of the mammalian retina. Absorption of a photon changes the 11-cis-retinal part of the molecule to all-trans-retinal....

Q: A block of birch wood floats in oil with 90.0

A block of birch wood floats in oil with 90.0% of its volume submerged. What is the density of the oil? The density of the birch is 0.67 g/cm3.

Q: When a plot is made of x-ray intensity versus wavelength

When a plot is made of x-ray intensity versus wavelength for a particular x-ray tube, two sharp peaks are superimposed on the continuous x-ray spectrum. These sharp peaks are called “characteristic” x...

Q: What happens to the energies of the characteristic x-rays when

What happens to the energies of the characteristic x-rays when the potential difference accelerating the electrons in an x-ray tube is doubled?

Q: An experiment shines visible light on a target and measures the wavelengths

An experiment shines visible light on a target and measures the wavelengths of light scattered at different angles. Would the experiment show that the scattered photons are Compton-shifted? Explain.

Q: Some stars are reddish in color, others bluish, and others

Some stars are reddish in color, others bluish, and others yellowish- white (like the Sun). How is the color related to the surface temperature of the star? What color are the hottest stars? What colo...