For bright stars to form, the protostars must condense in dense, dark nebulae
Indicate whether the statement is true or false
TRUE
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A tuning fork has a frequency of 400 Hz and hence a period of 2.50 × 10^-3 s. If the tuning fork is in an inertial frame of reference moving by the observer at speed of 0.680c, what is the frequency of the fork as measured by the observer? (Assume that measurements are strictly by optical means and that the speed of sound waves in air is not pertinent here.)
a. 454 Hz c. 605 Hz b. 293 Hz d. 265 Hz
An engine’s tank is filled with water. When the engine operates, it slowly freezes the water in the tank, converting the energy released to mechanical energy.
A. first kind B. second kind
If the frequency of a light beam is doubled, what happens to the momentum of the photons in that beam of light?
A) It stays the same. B) It is halved. C) It is doubled. D) It is reduced to one-fourth of its original value. E) It is increased to four times its original value.
A shift in the position of an emission line of an element toward the red or blue is produced by ____
a. atoms that become ionized b. electrons that transfer from a high energy level to a low energy level c. electrons that transfer from a low energy level to a high energy level d. the intensity of agitation of atoms in a hot gas e. the motion of an object toward or away from the observer