Of the frequencies listed below, to which one is the human ear most sensitive?
a. 33 Hz
b. 330 Hz
c. 3 300 Hz
d. 33 000 Hz
c
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Before a thunder storm, clouds in the sky likely become
A) conducting. B) polarized. C) grounded. D) a field-free region.
Although Saturn and Jupiter have similar compositions their outer appearances are different because
A. Saturn's cooler temperatures allow for the formation of a hazy layer of ammonia clouds that surrounds the planet. B. Saturn has more water molecules throughout its atmosphere giving it a uniform appearance. C. Saturn's smaller size means it has a weaker gravitational field and thus less dramatic atmospheric effects. D. Saturn's magnetic field is weaker than Jupiter's magnetic field.
A 20-cm length of wire is held along an east-west direction and moved horizontally to the north with a speed of 3.0 m/s in a region where the magnetic field of the earth is 60 ?T directed 30° below the horizontal. What is the magnitude of the potential difference between the ends of the wire?
a. 36 ?V b. 18 ?V c. 31 ?V d. 24 ?V e. 21 ?V
What is the phase difference in a Young's double slit experiment where the intensity is half that of the central maximum?
A) 45° B) 180° C) 90° D) 23° E) 245°