Which force field can accelerate an electron?
A) electric field
B) magnetic field
C) both of these
D) neither of these
Answer: C
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Current searches for extraterrestrial intelligence use radio telescopes at wavelengths
a. which must be shorter than the local wavelengths emitted by Earth's atmosphere b. which must be longer than the radio wavelength "noise" naturally emitted by our galaxy c. Both conditions "a" and "b" above must be fulfilled. d. Wrong! Visual light wavelengths are used because they are blocked by dust between the stars.
Parallel-Plate Capacitor: Two large parallel plates are separated by 1.0 mm of air. If the potential difference between them is 3.0 V, what is the magnitude of their surface charge densities? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 2.7 × 10-8 C/m2 B. 1.6 × 10-4 C/m2 C. 5.3 × 10-8 C/m2 D. 3.3 × 10-4 C/m2
A watt is equal to
a. 746 horsepower. b. one calorie. c. one joule. d. 1 J/s. e. a unit of energy.
The Q value for a particular reaction is -2.4 MeV, and the reaction's threshold energy is 9.60 MeV. What is the ratio of the mass of the incident particle to the mass of the stationary target nucleus?
A) -0.75 B) 0.25 C) 3 D) 4 E) 5