Venus is brightest as seen from Earth:
A) at greatest eastern elongation, appearing half lit in the evening sky.
B) at greatest western elongation, appearing half lit in the morning sky.
C) 36 days before or after inferior conjunction, appearing as a large crescent.
D) at inferior conjunction, when closest to Earth and largest in apparent size.
E) at superior conjunction, and fully lit.
C
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What will be an ideal response?
Electromagnetic radiation of wavelength 2.5 cm is which type?
A) microwaves B) AM-radio C) visible D) FM-radio E) ultraviolet
You stand on a scale to measure your weight. The reaction to the force the Earth exerts on you is
A. the force the Earth exerts on the scale. B. the force you exert on the Earth. C. the force the scale exerts on you. D. the force you exert on the scale. E. the force the scale exerts on the Earth.
When tuning a radio to a particular station, you match the frequency of the internal electrical circuit with the frequency of the wanted radio station. What principle is being employed?
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