When the frequency of the light is increased in a photoelectric effect experiment, the energy of the emitted electrons increases
a. True
b. False
Indicate whether the statement is true or false
True
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Scientists are in agreement that any world harboring living things must have significant quantities of:
A) helium and hydrogen. B) oxygen and nitrogen. C) some type of liquid. D) some type of sugar.
Which of the following statements about the greenhouse effect is true?
A) Without the naturally occurring greenhouse effect, Earth would be too cold to have liquid oceans. B) A weak greenhouse effect operates on Mars. C) The burning of fossil fuels increases the greenhouse effect on Earth because of the release of carbon dioxide. D) One result of an increased greenhouse effect on Earth may be an increased number of severe storms. E) All of the above are true.
The potential applied to a 20. ? resistor is 60. cos (33. t) volts. What is the:
(a) instantaneous current? (b) rms current?
The velocity of a particle (m = 10 mg, q = ?4.0 ?C) at t = 0 is 20 m/s in the positive x direction. If the particle moves in a uniform electric field of 20 N/C in the positive x direction, what is the particle's speed at t = 5.0 s?
a. 60 m/s b. 20 m/s c. 45 m/s d. 40 m/s e. 70 m/s