If y = 0.02 sin (30x ? 400t) (SI units), the wavelength of the wave is
a. ?/15 m
b. 15/? m
c. 60? m
d. 4.2 m
e. 30 m
a
Physics & Space Science
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Answer the following statement true (T) or false (F)
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A 1-kg block of iron weighs about
A) 1 N. B) 5 N. C) 10 N. D) more than 10 N.
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When droplets of condensation form on the outside of a glass of ice water, it must be that in the air right next to the glass
a. the temperature is near the dew point. b. the humidity is near the saturation density. c. the relative humidity is near 100%. d. all of the above
Physics & Space Science
The amount of light from an incandescent lamp that is transmitted through an ideal Polaroid filter is half, and through a real Polaroid filter is
A) less than half. B) more than half. C) half.
Physics & Space Science