How long does it take to complete the full cycle of moon phases?
What will be an ideal response?
29.5 days
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Which of the following is not considered crucial for life to exist on some world?
A) liquid water B) a source of energy that can be used by life C) a source of nutrients D) an atmosphere
A beam of light in air is incident at an angle of 24.0° to the surface of a rectangular block of clear plastic (n = 1.46). The light beam first passes through the block and re-emerges from the opposite side into air at what angle to the normal to that surface?
a. 36° b. 16° c. 24.0° d. 29° e. 0.64°
Electromagnetic waves consist of
A) compressions and rarefactions of electromagnetic pulses. B) oscillating electric and magnetic fields. C) particles of light energy. D) high-frequency sound waves.
A light ray is partially reflected and partially refracted at a boundary between two media, the upper one having index of refraction n, the lower one having index of refraction n', as shown in the figure. The reflected ray is perpendicular to the refracted ray when
A.
.B.
.C.
.D.
.E.
.