When light enters a denser medium and is refracted,
a. the wavelength is unchanged.
b. the wave speed increases.
c. the frequency is unchanged.
d. the wavelength increases.
c
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What is the likely reason that we cannot find any examples of the first generation stars?
A) The first generation stars are too faint to be visible now. B) The first generation stars formed such a long time ago that the light from them has not yet had time to reach us. C) The first generation stars were all very massive and exploded as supernova. D) The first generation stars formed with only H and He and therefore have no spectral features. E) We do not know how the first generation stars were formed.
The beginning of the Paleozoic is marked by the emergence of
A) organisms with hard parts. B) fish and fungi. C) extensive glaciated deposits. D) none of these
The following equation has been proposed for the heat transfer coefficient in natural convection from long vertical cylinders to air at atmospheric pressure:
Where Tf = the film temperature = 1/2 (Ts + T?) and Tf is in the range 0 to 200°C The corresponding equation in dimensionless form is
Compare the two equations, to determine those values of C, m and n in the second
equation that will give the same results as the first equation.
GIVEN
Empirical equations shown above
FIND
Values of C, m and n
ASSUMPTIONS
Air behaves as an ideal gas
Explain in your own words: (a) what is the mode of heat transfer through a large steel plate that has its surfaces at specified temperatures? (b) what are the modes when the temperature on one surface of the steel plate is not specified, but the surface is exposed to a fluid at a specified temperature.
GIVEN
(a) Steel plate with specified surface temperatures
(b) Steel plate with one specified temperature and another surface exposed to a fluid
FIND
(a) Modes of heat transfer
SKETCH
