When a solid melts,

A) the temperature of the substance increases.
B) the temperature of the substance decreases.
C) heat energy leaves the substance.
D) heat energy enters the substance.


Answer: D

Physics & Space Science

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Compton Scattering: A 140-keV photon strikes an electron and scatters through an angle of 120° from its original direction. (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)(a) What is the wavelength of the photon before scattering?(b) What is the photon wavelength after scattering?

What will be an ideal response?

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If an object of mass 20 kg on earth is sent to the moon it will have a mass of

A. 10 kg. B. 20 kg. C. 0.0 kg. D. 4.0 kg.

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The diagram illustrates a light source, a gas cloud, and three different lines of sight. Along which line of sight would an observer see an absorption spectrum?

image

a. 1
b. 2
c. 3
d. 2 and 3
e. none of them

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A ring and a disk both at rest roll down a hill together. Which rolls slower?

A) ring B) disk C) depends on the masses D) both roll at the same speed E) need more information

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