Which of these is a result first obtained by Planck?
a. That energy is emitted continuously from each atom.
b. That different materials used to construct the hollow block with a small hole emit different energy spectral distributions.
c. That energy is emitted in discrete quanta.
d. That light exists only as photons.
e. That at high temperatures, electromagnetic radiation is more intense at shorter wavelengths.
c
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If the ac peak current through a 100 ohm resistor is 1.7 A, the average power dissipated by the resistance is
A) 85 W. B) 170 W. C) 289 W. D) 220 W. E) 145 W.
When we measure the broadening of absorption lines in the spectrum of an elliptical galaxy, we can infer
A) how quickly the galaxy is forming new stars. B) how fast the stars in the galaxy are moving relative to one another. C) the galaxy's rotation curve. D) the amount of gas and dust in the galaxy. E) the mass of the black hole at the galaxy's center.
A wire in a uniform magnetic field of 0.350 T carries a current of 3.50 A. If the magnitude of the magnetic force per unit length on the wire is 0.278 N/m, what is the angle between the magnetic field and the current?
a. 13.1° b. 19.9° c. 4.56° d. 52.6°
What is Jupiter's Great Red Spot?
A) the place where reddish particles from Io impact Jupiter's surface B) a hurricane that comes and goes on Jupiter C) a large mountain peak poking up above the clouds D) a long-lived, high-pressure storm E) the place where Jupiter's aurora is most visible