What is the main reason that hydrogen-driven automobiles have not replaced gasoline ones?
A. Hydrogen is too expensive.
B. Hydrogen is too difficult to store in an automobile.
C. Hydrogen is radioactive, and the public fears it.
D. Hydrogen mixed with air is explosive
Answer: B. Hydrogen is too difficult to store in an automobile.
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Two coherent waves, each with intensity I0, reach the same point in phase. The amplitude of the superposed wave is _________.
A. 0 B. I0 C. 2I0 D. 3I 0 E. 4I 0
The probability cloud for the electron in the hydrogen atom has an average radius
A) quite different from the radius predicted by Bohr. B) in agreement with the orbital radius of Bohr. C) as yet not accurately measured.
One time constant after an RL circuit has its switch closed, how does the current I in it compare to the maximum current Imax that occurs for this circuit?
a. I > Imax/2 b. I = Imax/2 c. I < Imax/2 d. Without knowing R and L, this cannot be determined.
Because of their short lifetimes, very few muons that are produced in the upper atmosphere at high speeds should be observed at the surface of the earth. Yet we detect large numbers of muons at ground level because of
a. time dilation b. length contraction c. the equivalence of mass and energy d. the principle of relativity e. none of the above