Questions from Modern Physics

Q: In the crystallography lab where you work, you are given a

In the crystallography lab where you work, you are given a single crystal of an unknown substance to identify. To obtain one piece of information about the substance, you repeat the Davissonâ
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Q: As an amateur astronomer, you are studying the apparent brightness of

As an amateur astronomer, you are studying the apparent brightness of stars. You know that a star’s apparent brightness depends on its distance from the earth and also on the fractio...

Q: You take a lens and mask it so that light can pass

You take a lens and mask it so that light can pass through only the bottom half of the lens. How does the image formed by the masked lens compare to the image formed before masking?

Q: An atom with mass m emits a photon of wavelength λ.

An atom with mass m emits a photon of wavelength λ. a. What is the recoil speed of the atom? b. What is the kinetic energy K of the recoiling atom? c. Find the ratio K/E, where E is the energy of t...

Q: The negative muon has a charge equal to that of an electron

The negative muon has a charge equal to that of an electron but a mass that is 207 times as great. Consider a hydrogen like atom consisting of a proton and a muon. a. What is the reduced mass of the...

Q: A photon of green light has a wavelength of 520 nm.

A photon of green light has a wavelength of 520 nm. Find the photon’s frequency, magnitude of momentum, and energy. Express the energy in both joules and electron volts.

Q: For the situation shown in Fig. 34.3, is

For the situation shown in Fig. 34.3, is the image distance s′ positive or negative? Is the image real or virtual? Explain your answers. From Fig. 34.3:

Q: The image of a tree just covers the length of a plane

The image of a tree just covers the length of a plane mirror 4.00 cm tall when the mirror is held 35.0 cm from the eye. The tree is 28.0 m from the mirror. What is its height?

Q: Explain why the focal length of a plane mirror is infinite,

Explain why the focal length of a plane mirror is infinite, and explain what it means for the focal point to be at infinity.

Q: If a spherical mirror is immersed in water, does its focal

If a spherical mirror is immersed in water, does its focal length change? Explain.