Why does light come in different colors?
a) differences in the wavelength
b) it travels at different speeds
c) warping of space it travels through
d) differences in intensity of radiation
e) bending of light in space
Ans: a) differences in the wavelength
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You observe an object to be moving in a straight line at a constant speed. What can you conclude? (Assume the object does not have any engines or other power source.)
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