If you see Alice going to your left at exactly 0.99c and Bob going to your right (away from Alice) at exactly 0.99c, what will Alice say Bob is doing?
A) going away from her at 1.98c
B) going away from her at exactly 0.99c
C) going away from her at exactly c
D) going away from her at about 0.98c
E) going away from her faster than 0.99c, but slower than c
E) going away from her faster than 0.99c, but slower than c
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What will be an ideal response?
If there around 10,000 transmitting civilizations in the Milky Way, then theoretically the Allen Telescope Array, when it is complete, might be capable of detecting a signal within a few
A) years B) centuries C) months D) decades
Gravity acts over a limited distance range
a. True b. False Indicate whether the statement is true or false
The "seeing" ability or resolution of radiation is determined by its wavelength. If the size of an atom is approximately 10-10 m, how fast must an electron travel to have a wavelength smaller than that of an atom? (me = 9.11 × 10^-31 kg and h = 6.63 × 10^-34 J×s)
a. 1.0 × 10^6 m/s c. 5.4 × 10^5 m/s b. 7.3 × 10^6 m/s d. 3.4 × 10^6 m/s