What value of B should be used in a velocity selector to separate out 2.0-keV protons if E is fixed at 80 kV/m?
a. 0.18 T
b. 0.11 T
c. 0.15 T
d. 0.13 T
e. 0.23 T
d
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Radioactive Decay: Plutonium has a half life of 2.4 × 104 years. How long does it take for 99.0% of the plutonium to decay?
A. 1.6 × 102 y B. 1.6 × 103 y C. 1.6 × 104 y D. 1.6 × 105 y E. 1.6 × 106 y
Intensity of Sound: If the intensity level by 15 identical engines in a garage is 100 dB, what is the intensity level generated by each one of these engines?
A. 67 dB B. 13 dB C. 44 dB D. 88 dB
What is the closest stellar system to the Solar System & how far away is it?
A. Sirius, about 8.6 light years away B. Alpha Centauri, about 4.3 light years away C. Wolf 359, about 359 AU away D. Barnard's Star, about 6 AU away E. Alpha Centauri, about 4.3 AU away
Suppose you live on the Moon. How long is a day (i.e., from sunrise to sunrise)?
A) 23 hours 56 minutes B) 24 hours C) a lunar month D) a year E) about 18 years