Which of the following statements about thermal radiation is always true?
A) A hot object emits more X-rays than a cool object.
B) A hot object emits more radio waves than a cool object.
C) A hot object emits photons with a longer wavelength than a cool object.
D) A hot object emits photons with a higher average energy than a cool object.
D
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The dark spots in this photo (such as the one indicated by the arrow) represent what we call
A) sunspots. B) convection zones. C) coronal holes. D) solar prominences. E) Great Dark Spots.
Which of the following did the planetary model of the atom fail to explain?
A. the relationship between orbital radius and energy B. why alpha particles in Rutherford’s experiment deflected at high angles when incident on atomic foils C. why most alpha particles in Rutherford’s experiment passed with little deflection through atomic foils D. why electrons in atoms don’t radiate all their energy away rapidly
Velma is in a rocket ship moving north past Mort at half of lightspeed relative to Mort. She fires a laser beam forward from the front of her ship. Mort sees the laser beam move at
A) slightly faster than c. B) slightly slower than speed c [lightspeed]. C) 1.5c. D) c. E) 0.5c.