What is the de Broglie wavelength for a proton (m = 1.67 × 10^?27 kg) moving at a speed of 2.9 × 10^6 m/s? (h = 6.63 × 10^?34 J?s)
a. 6.84E–14 m
b. 2.06E–14 m
c. 2.29E–13 m
d. 1.37E–13 m
e. 3.82E–13 m
d
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Transformers: The primary of an ideal transformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be
A. 50 V. B. 100 V. C. 200 V. D. none of the given answers.
If the Universe is infinitely large, infinitely old, and expanding, the night sky should be bright. But in fact, it is not. What do we call this?
A. Olbers' paradox B. Grand Unified Theory C. the Neutrino Discrepancy D. the Cosmological Principle E. the Hubble Distance law
The main sequence is luminosity class V
Indicate whether the statement is true or false
A major league pitcher is recorded as having thrown a 105 mph fastball. What is the speed of the pitch in m/s? One mile is equivalent to 1609m.
A. 15 m/s B. 235 m/s C. 47 m/s D. 34 m/s