A spaceship approaches Earth with a speed 0.50c. A passenger in the spaceship measures his heartbeat as 70 beats per minute. What is his heartbeat rate according to an observer that is at rest relative to Earth?
A) 73 beats per minute
B) 61 beats per minute
C) 75 beats per minute
D) 65 beats per minute
E) 69 beats per minute
B
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Photovoltaic cells will never be much cheaper than now
What will be an ideal response?
The fact that many different organisms on Earth have developed eyesight provides evidence for
A) cross-breeding B) artificial selection C) convergent evolution D) genetic mutations
Compared to a hydrogen atom where the proton and electron both have spin in the same direction, an atom where they spin in opposite directions will have ________ energy
Fill in the blank(s) with correct word
For experiments involving the setup shown in figure Q4.1b, which of the following possible results (if seen) regarding the final value displayed by the voltmeter would probably not be consistent with the wave model of light? 
A. It increases as the light’s intensity increases. B. It is independent of the light’s intensity. C. It varies as the light’s wavelength changes. D. It increases as the rate of electron ejection increases.