Compared to the mass of a proton, the mass of an electron is
A) very much less.
B) identical.
C) greater.
Answer: A
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Torque: A flat circular wire loop of area 0.25 m2 carries a current of 5.0 A. This coil lies on a horizontal table with the current flowing in the counterclockwise direction when viewed from above. At this point, the earth's magnetic field is 1.2 × 10-5 T directed 60° below the horizontal. What is the magnitude of the torque that the earth's magnetic field exerts on this loop?
A. 2.5 × 10-6 N ? m B. 5.0 × 10-6 N ? m C. 7.5 × 10-6 N ? m D. 1.0 × 10-5 N ? m
Air moves away from a high-pressure region where it
A) sinks. B) rises. C) cools. D) stops.
Standing Waves on a String: The speed of propagation of a transverse wave on a 2.0-m long string fixed at both ends is 200 m/s. Which one of the following is not a resonant frequency of this string?
A. 25 Hz B. 50 Hz C. 100 Hz D. 200 Hz
The greater the frequency of light, the greater the ______________ of its photons
a. velocity b. speed c. wavelength d. energy