Stars less massive than 0.4 solar mass never become giant stars
a. True
b. False
Indicate whether the statement is true or false
True
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The greenhouse effect keeps the surface of ________ warmer than it otherwise would be.
A. Mercury B. Earth C. Venus D. All of these choices are correct. E. None of these choices is correct.
A turbine takes in 2 200-K steam and exhausts the steam at a temperature of 200 K. What is the maximum theoretical efficiency of this system?
a. 83% b. 75% c. 91% d. 68% e. 62%
When a neutron decays, a proton and an electron are observed. When the electrons emitted from a sample of neutrons are observed, they are found to have different kinetic energies. This was accounted for by
a. introducing a different particle, the neutrino. b. introducing the effect of gravity on the particles. c. including the kinetic energies of the neutron and proton. d. modifying the laws of conservation of momentum and energy. e. taking into account the uncertainties associated with Heisenberg's Uncertainty Principle.
The region of the electromagnetic spectrum with wavelengths just less than those in the ultraviolet region is the ______________ region
a. x-rays b. radio waves c. microwaves d. infrared e. gamma rays