Giant and supergiant stars are rare because that stage of stellar evolution is short

a. True
b. False
Indicate whether the statement is true or false


True

Physics & Space Science

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In experiments involving the setup shown in figure Q4.1b, the value that the voltmeter displays increases for a short period of time after light starts shining on the cathode, but then quickly settles down to a fixed value. Why?

A. The cathode eventually stops emitting electrons. B. The kinetic energy of ejected electrons starts out small but quickly reaches a maximum value. C. The charge difference between the cathode and anode is initially small but with time becomes so large that no electron from the cathode can make it to the anode. D. The cathode eventually runs out of electrons to emit. E. Some other explanation (describe).

Physics & Space Science

If there is a net torque on a wheel, then

A. the wheel cannot be spinning. B. the angular momentum of the wheel cannot change direction. C. there must be a net force on the wheel. D. the wheel must have a nonzero angular acceleration.

Physics & Space Science

The absolute magnitude scale is defined so that a difference of five magnitudes is a luminosity difference of ________

Fill in the blank(s) with correct word

Physics & Space Science

In the GUT, electromagnetism and the strong nuclear force are the last to appear

Indicate whether the statement is true or false

Physics & Space Science