Questions from College Physics

Q: A lens (n = 1.52) is coated with

A lens (n = 1.52) is coated with a magnesium fluoride film (n = 1.38). (a) If the coating is to cause destructive interference in reflected light for λ = 560 nm (the peak of the solar spectrum), what...

Q: The activity of a sample containing radioactive 108Ag is 6.4

The activity of a sample containing radioactive 108Ag is 6.4 × 104 Bq. Precisely 12 min later, the activity is 2.0 × 103 Bq. Calculate the half-life of 108Ag.

Q: You decide to test your physics knowledge while going over a waterfall

You decide to test your physics knowledge while going over a waterfall in a barrel. You take a baseball into the barrel with you, and as you are falling vertically downward, you let go of the ball. Wh...

Q: Refer to the pulse in Problem 9. (a)

Refer to the pulse in Problem 9. (a) What is the speed of propagation of the pulse? (b) At what average speed does the point at x = 2.0 m move during this time interval?

Q: A beam of neutrons is used to study molecular structure through a

A beam of neutrons is used to study molecular structure through a series of diffraction experiments. A beam of neutrons with a wide range of de Broglie wavelengths comes from the core of a nuclear rea...

Q: A dentist holds a small mirror 1.9 cm from a

A dentist holds a small mirror 1.9 cm from a surface of a patient's tooth. The image formed is upright and 5.0 times as large as the object. (a) Is the image real or virtual? (b) What is the focal l...

Q: Verify that the collision between the proton and the nitrogen nucleus in

Verify that the collision between the proton and the nitrogen nucleus in Example 26.4 is elastic.

Q: A packing carton slides down an inclined plane of angle 30.

A packing carton slides down an inclined plane of angle 30.0° and of incline length 2.0 m. (a) If the initial speed of the carton is 4.0 m/s directed down the incline, what is the speed at the bottom...

Q: While I1 is increasing, does current flow in loop 2?

While I1 is increasing, does current flow in loop 2? If so, does it flow clockwise or counterclockwise as viewed from the right? Explain.

Q: What average force is necessary to bring a 50.0 kg

What average force is necessary to bring a 50.0 kg sled from rest to a speed of 3.0 m/s in a period of 20.0 s? Assume frictionless ice.