One phenomenon that demonstrates the particle nature of light is:
a. the photoelectric effect.
b. diffraction effects.
c. interference effects.
d. the prediction by Maxwell's electromagnetic theory.
a
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Deuterium and tritium are both
A) forms of hydrogen. B) isotopes of the same element. C) both of these D) neither of these
Is there any method by which we can detect individual atoms in the laboratory?
A) Yes, by using microscopes based on X-rays rather than on light. B) Yes, by using very high power microscopes based on visible light of very short wavelength. C) No, because atoms are purely mathematical abstractions and not real physical objects. D) Yes, by using microscopes based on the "matter waves" made by material particles such as electrons. E) No, because atoms are smaller than any physical wavelengths.
Suppose 150 Joules of work is done on a system and that 300 Joules of heat are delivered to the system. Which of these is predicted by the first law of thermodynamics?
A. The internal energy U of the system increases by 450 J, since Q = +300 and W = -150 B. The internal energy U of the system increases by 150 J, since Q = +300 and W = +150 C. The internal energy U of the system decreases by 150 J, since Q = -300 and W = +150 D. The internal energy U of the system does not change
Support a horizontal toothpick at both ends. Then do likewise for a log of the same kind of wood. There is more sag in the
A) toothpick. B) log. C) same in each