At what wavelength would a star radiate the greatest amount of energy if the star has a surface temperature of 10,000 K?
a. 10 nm
b. 100 nm
c. 300 nm
d. 1.0 × 10^4 nm
e. 3.0 × 10^10 nm
c
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Each of the following is a prediction of the theory of relativity (special or general). Which one is crucial to understanding how the Sun provides light and heat to the Earth?
A) E = mc2 B) Gravity is curvature of spacetime. C) If you observe someone moving by you, you'll see his or her time running slow. D) Space is different for different observers. Time is different for different observers. Spacetime is the same for everyone.
Three balls of equal mass start from rest and roll down different ramps. All ramps have the same height. but different steepness. Which ball has the greater speed at the bottom of its ramp?
a. The ball from steepest ramp b. The ball from the least steep ramp c. They will all have the same speed since the ramps are all the same height
What part of a comet always points most directly away from the Sun?
A) the coma B) the jets of gas C) the dust tail D) the plasma tail E) the nucleus
A series circuit has equal values for resistance, capacitive reactance, and inductive reactance. The phase angle for this circuit is:
a. 60°. b. –60°. c. 180°. d. not given.