The wavelength of maximum intensity is useful in measuring the ____
a. surface temperatures of an object from their colors
b. distance to an object from their colors
c. chemical composition of an object
d. motion of an object across the observer's line of sight
e. motion of an object toward or away from the observer
a
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The sky is blue because air molecules in the sky act as tiny
A) mirrors which reflect only blue light. B) optical tuning forks that scatter blue light. C) sources of white light. D) prisms. E) none of the above
In an elastic collision between two bodies of mass m1 and m2, with m2 initially at rest, mass 1 moves off at angle ? relative to the direction of its initial velocity and mass 2 at angle ?. An exam paper shows the equations below: m1v1i0 = m1v1f cos? + m2v2f sin?= m1v1f sin? + m2v2f cos?What error(s) has the student made?
A. In the first equation, m2v2f sin? should be m2v2f cos?. B. In the second equation, m2v2f cos? should be m2v2f sin?. C. In the second equation, the plus sign between the terms on the right should be a minus sign. D. All of the errors listed above. E. Only errors (a) and (b) above.
Pitch is related to what physical characteristic of a wave?
A. Wavelength B. Speed C. Frequency D. Amplitude
What two quantities did Edwin Hubble compare for a sample of galaxies to discover the expansion of the universe?
A) age and distance B) velocity and distance C) velocity and temperature D) luminosity and distance E) luminosity and temperature