Questions from Modern Physics


Q: One of the wavelengths of light emitted by hydrogen atoms under normal

One of the wavelengths of light emitted by hydrogen atoms under normal laboratory conditions is l = 656.3 nm, in the red portion of the electromagnetic spectrum. In the light emitted from a distant ga...

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Q: A photographic slide is to the left of a lens. The

A photographic slide is to the left of a lens. The lens projects an image of the slide onto a wall 6.00 m to the right of the slide. The image is 80.0 times the size of the slide. a. How far is the s...

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Q: In a particle accelerator a proton moves with constant speed 0.

In a particle accelerator a proton moves with constant speed 0.750c in a circle of radius 628 m. What is the net force on the proton?

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Q: In a photoelectric-effect experiment, which of the following will

In a photoelectric-effect experiment, which of the following will increase the maximum kinetic energy of the photoelectrons? a. Use light of greater intensity; b. use light of higher frequency; c....

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Q: Figure P34.81 shows an object and its image formed by

Figure P34.81 shows an object and its image formed by a thin lens. a. What is the focal length of the lens, and what type of lens (converging or diverging) is it? b. What is the height of the image?...

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Q: Can Compton scattering occur with protons as well as electrons? For

Can Compton scattering occur with protons as well as electrons? For example, suppose a beam of x rays is directed at a target of liquid hydrogen. (Recall that the nucleus of hydrogen consists of a sin...

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Q: The cornea of the eye has a radius of curvature of approximately

The cornea of the eye has a radius of curvature of approximately 0.50 cm, and the aqueous humor behind it has an index of refraction of 1.35. The thickness of the cornea itself is small enough that we...

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Q: Why must engineers and scientists shield against x-ray production in

Why must engineers and scientists shield against x-ray production in high-voltage equipment?

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Q: Some lasers emit light in pulses that are only 10-12

Some lasers emit light in pulses that are only 10-12 s in duration. The length of such a pulse is (3 * 108 m/s)(10-12 s) = 3 * 10-4 m = 0.3 mm. Can pulsed laser light be as monochromatic as light from...

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Q: There is a certain probability that a single electron may simultaneously absorb

There is a certain probability that a single electron may simultaneously absorb two identical photons from a high-intensity laser. How would such an occurrence affect the threshold frequency and the e...

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