The source of energy that powers the Sun is
A) chemical potential energy of hydrogen.
B) mass energy released by nuclear fusion.
C) gravitational potential energy of the contraction of the gas cloud that formed the Sun.
D) kinetic energy of the orbital motion of the Sun.
E) thermal energy of the hydrogen atoms in the Sun.
B) mass energy released by nuclear fusion.
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Within about 4 AU, all planets are rocky
Indicate whether the statement is true or false
A greater gravitational field causes time to
A) speed up. B) slow down. C) fluctuate. D) Gravity has no measurable effect on time.
Seyfert galaxies
a. are more common in close pairs of galaxies than in isolated systems. b. emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. c. generally show redshifts greater than 6. d. are more common in close pairs of galaxies than in isolated systems and emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. e. are more common in close pairs of galaxies than in isolated systems; emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies; and generally show redshifts greater than 6.
A microphone records sound produced from two speakers in a room with no other sound sources. If the intensity of one of the sound waves at a given location is 0.055 W/m2 and if the microphone receives a minimum intensity of 0.004 
when both speakers are active what is a possible value for the intensity of the other source at the microphone’s location?
A. Need more info to solve.
B. 0.088 
C. 0.051
D. 0.048