Infrared waves are often called heat waves because they
40)
A) emanate from relatively hot sources.
B) consist of frequencies lower than those of visible light.
C) induce resonance in molecules and increase internal energy in a substance.
D) are the predominant waves emitted by the sun.
Answer: C
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The figure shows two point sources of light, A and B, that emit light waves in phase with each other. A is a distance of 3? from point P. B is distant 5? from P. (? is the wavelength.) The phase difference between the waves arriving at P from A and B is
?
?
a.
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