A buzzer with frequency f0 is thrown straight upwards. On the buzzer's trip down, what is the frequency behavior heard by an observer below?
a. The frequency heard is still f0.
b. The frequency is a constant one greater than f0.
c. The frequency is an increasing one greater than f0.
d. The frequency is a decreasing one less than f0.
c
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In star clusters, the ____ stars are giant stars fusing helium in their cores and then in their shells
a. turnoff point b. main sequence c. turnon point d. hydrogen flash e. horizontal branch
Which of the following places is the result of volcanoes erupting over a hot spot in the mantle?
A) Hawaii B) the Himalayas C) the Appalachians D) California
The Compton wavelength, h/mec, equals 0.002 43 nm. In Compton scattering, what is the greatest shift, ??, in wavelength that can occur?
a. ?? > 2 h/mec b. ?? = 2 h/mec c. ?? = h/mec d. ?? < h/mec
The magnetic and rotational north poles on Earth are the same
Indicate whether the statement is true or false