When two identical waves arrive at the same place in phase, there is destructive interference
a. True
b. False
Indicate whether the statement is true or false
False
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Absorption lines in the spectra of supergiant stars are broader than the same spectral lines in main-sequence stars of the same spectral type
a. True b. False Indicate whether the statement is true or false
The Schwarzschild radius of a black hole is about 3 km per solar mass
Indicate whether the statement is true or false
Velma passes Mort at a high speed. According to Mort, his clock has progressed by one hour while Velma's clock progressed by only 40 minutes. What does Velma observe?
A) Mort's clock progressed by one hour while Velma's clock progressed by 80 minutes. B) Mort's clock progressed by 40 minutes while Velma's clock progressed by one hour. C) Mort's clock progressed by one hour while Velma's progressed by 40 minutes. D) both clocks progressed by one hour. E) The answer cannot be determined, because we don't know Velma's speed.
Which of the following is currently supplying high resolution X-ray images from space?
A) COBE B) HEAO-2 C) ROSAT D) Chandra E) Einstein