When the frequency of the light is increased in a photoelectric effect experiment, the energy of the emitted electrons
a. increases
b. decreases
c. stays the same
d. becomes more quantized
e. becomes less quantized
A
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Which of the following correctly lists spectral types in order of decreasing temperature (from hottest to coolest)?
A) MKGFABO B) OBAGFKM C) OBAFGKM D) ABFGKMO E) BAGFKMO
Which of the following processes is involved in the sunspot cycle?
A) a large change in the amount of visible light emitted by the Sun B) an imbalance in the operation of the solar thermostat C) a slight gravitational contraction of the Sun D) small variations in the rate of nuclear energy generation in the solar interior E) the winding of magnetic field lines due to the Sun's rotation
Irregular galaxies, although small, have large H II regions and much on-going star formation for their size
Indicate whether the statement is true or false
The average star spends ________ of its lifetime on the main sequence
a. 1% b. 2% c. 10% d. 20% e. 90%