Our Sun is a star of spectral type
A) G.
B) F.
C) S.
D) M.
A) G.
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If a source of light is approaching us at 3,000 km/sec, then all its waves are
A) redshifted by 1%. B) not affected, as c is constant regardless of the direction of motion. C) blueshifted out of the visible spectrum into the ultraviolet. D) blueshifted by 1%. E) redshifted out of the visible into the infrared.
If two electrons are at rest a short distance apart, the electromagnetic forces they exert on each other will be
A) electric but not magnetic. B) zero. C) magnetic but not electric. D) both electric and magnetic.
The angular diameters of the Moon and Sun vary slightly because the orbits of the Moon and Earth are slightly elliptical
a. True b. False Indicate whether the statement is true or false
A resting blood pressure of 140 over 90 or more is considered hypertension.
Answer the following statement(s) true (T) or false (F)