Two objects, A and B, are placed in thermal contact. The entropy of object A decreases. What can be said about the relationship between the temperatures of the two objects?
a. TA < TB
b. TA > TB
c. TA = TB
d. not enough information to say
b
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Compton Scattering: A certain photon, after being scattered from a free electron that was at rest, moves at an angle of 120° with respect to the incident direction. If the wavelength of the incident photon is 0.591 nm, what is the wavelength of the scattered photon? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 0.380 nm B. 0 nm C. 0.550 nm D. 0.591 nm E. 0.595 nm
The Eiffel tower in Paris is made primarily of iron, whose coefficient of linear expansion is about 10 × 10^?6/°C. On a cold day when the temperature is ?10°C the Eiffel tower is 300 meters tall. Its height on a hot day when the temperature is 40°C is 300.15 m
a. True b. False Indicate whether the statement is true or false
General Questions: In a collision between a huge SUV and a small hybrid car, the SUV exerts a larger force on the hybrid than the hybrid exerts on the SUV.
A. True B. False C. It depends on whether the collision is a head-on collision or a rear-end collision.
For a star of 10 solar masses, its main sequence life span will be:
A) ten times longer than our Sun's. B) about the same as the Sun's. C) only a tenth of the Sun's. D) about a hundred times less than the Sun's. E) only 1/1000th of the Sun.