A single-slit diffraction pattern is formed on a distant screen. Assuming the angles involved are small, by what factor will the width of the central bright spot on the screen change if the wavelength of the illuminating light is doubled?
A) It will be cut to one-quarter its original size.
B) It will be cut in half.
C) It will double.
D) It will become four times as large.
E) It will become eight times as large.
C
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At temperatures above 0.80 of the melting temperature and at very low stress, the primary mechanism of creep strain in metals is
(a) Cobel creep. (b) Dislocation glide (c) Dislocation creep (d) Herring-Nabarro vacancy flux
The ____________ planets have larger radii than the ____________ planets
Fill in the blank(s) with correct word
According to the laws of thermal radiation, hotter objects emit photons with
A) a shorter average wavelength. B) a lower average frequency. C) a lower average energy. D) a higher average speed.
In a capacitor in an AC circuit, the voltage:
a. lags the current by 90°. b. may lead or lag the current depending on the frequency. c. leads the current by 90°. d. is in phase with 70.7% of the current.