We can see each other in the classroom right now because we

A) emit visible light.
B) emit thermal radiation.
C) emit infrared light.
D) reflect visible light.
E) reflect infrared light.


D) reflect visible light.

Physics & Space Science

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A hoop (I = MR2) is rolling along the ground at 10 m/s. It comes to a hill and starts going up. Assuming no losses to friction, how far does it travel vertically up the hill before it stops?

a. 10 m c. 5.1 m b. 3.7 m d. 7.7 m

Physics & Space Science

What is the wavelength m of light in a material?

a. m = n b. m = /n c. m = + n d. m = 3 e. m = n/

Physics & Space Science

Suppose that at time t = 0 an electron in a magnetic field in the +z direction has state . Let The expectation value as a function of time in this case is which of the below?

A.
B.
C. 0
D.
E.
F. Something else (specify)

Physics & Space Science

The only spacecraft to go into orbit around Jupiter was:

A) Voyager 2. B) Pioneer 10. C) Cassini. D) Galileo. E) Viking I.

Physics & Space Science