White light is spread out into spectral hues by a diffraction grating. If the grating has 1 000 lines per cm, at what angle will red light (l = 640 nm) appear in first order?
a. 14.7°
b. 7.35°
c. 17.7°
d. 3.67°
e. 1.84°
D
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In an MRI medical imaging apparatus, the patient is subject to what kind of "radiation"?
A) gamma rays B) X-rays C) radio D) alpha radiation E) beta rays
Which force can act over distances comparable to the distance between planets?
a. only gravitational b. only electrical c. only magnetic d. All of the above.
The principle of equivalence tells us that
A) mass and energy are forms of each other. B) space and time are forms of each other. C) electricity and magnetism are forms of each other. D) observations made in an accelerating reference frame are indistinguishable from those made in a gravitational field. E) all of the above
Reactance: What is the reactance of a 20-mH inductor at a frequency of 60 Hz?
A. 7.5 ? B. 0.13 ? C. 1.2 ? D. 1.2 m? E. 7.5 m?