Questions from Modern Physics

Q: As you have seen, relativistic calculations usually involve the quantity γ

As you have seen, relativistic calculations usually involve the quantity γ. When γ is appreciably greater than 1, we must use relativistic formulas instead of Newtonian ones. For what speed v (in term...

Q: Contact lenses are placed right on the eyeball, so the distance

Contact lenses are placed right on the eyeball, so the distance from the eye to an object (or image) is the same as the distance from the lens to that object (or image). A certain person can see dista...

Q: a. At what speed is the momentum of a particle twice

a. At what speed is the momentum of a particle twice as great as the result obtained from the nonrelativistic expression mv? Express your answer in terms of the speed of light. b. A force is applied...

Q: How fast must a rocket travel relative to the earth so that

How fast must a rocket travel relative to the earth so that time in the rocket “slows down” to half its rate as measured by earth based observers? Do present-day jet planes approach such speeds?

Q: An electron is acted upon by a force of 5.00

An electron is acted upon by a force of 5.00 * 10-15 N due to an electric field. Find the acceleration this force produces in each case: a. The electron’s speed is 1.00 km/s. b. The electron’s speed...

Q: A thin lens with a focal length of 6.00 cm

A thin lens with a focal length of 6.00 cm is used as a simple magnifier. a. What angular magnification is obtainable with the lens if the object is at the focal point? b. When an object is examined...

Q: The focal length of a simple magnifier is 8.00 cm

The focal length of a simple magnifier is 8.00 cm. Assume the magnifier is a thin lens placed very close to the eye. a. How far in front of the magnifier should an object be placed if the image is fo...

Q: You want to view through a magnifier an insect that is 2

You want to view through a magnifier an insect that is 2.00 mm long. If the insect is to be at the focal point of the magnifier, what focal length will give the image of the insect an angular size of...

Q: The laws of optics also apply to electromagnetic waves invisible to the

The laws of optics also apply to electromagnetic waves invisible to the eye. A satellite TV dish is used to detect radio waves coming from orbiting satellites. Why is a curved reflecting surface (a “d...

Q: A person swimming 0.80 m below the surface of the

A person swimming 0.80 m below the surface of the water in a swimming pool looks at the diving board that is directly overhead and sees the image of the board that is formed by refraction at the surfa...