When we say that an electromagnetic field is "quantized," we mean that it
A) is allowed to have only certain particular values of total energy.
B) it fills up a region of space.
C) it is really made of particles known as electrons.
D) it is really made of particles known as photons.
E) it vibrates at one particular frequency.
A
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Matter belonging to the Galaxy can be traced out to ________ from the center
A) 5 kpc B) 8 kpc C) 15 kpc D) 50 kpc E) 200 kpc
Beam ACB has a sliding support at A and is supported at C by a pinned-end steel column with square cross section (E 5 200 GPa, b 5 40 mm) and height L 5 3.75 m. The column must resist a load Q at B with a factor of safety of 2.0 with respect to the critical load. The max-imum permissible value of Q is approximately:
(A) 10.5 kN
(B) 11.8 kN
(C) 13.2 kN
(D) 15.0 kN
During what month will the full moon achieve its maximum altitude, as observed from Wash ington, D.C. (39°N)? When will it have its minimum altitude?
Which of the following statements about quantum tunneling is true?
A) It is used in modern electronics, and, in fact, our modern-day computers would not work without it. B) It plays a crucial role in nuclear fusion in the Sun. C) It allows electrons and other subatomic particles to pass through wall-like energy barriers even when it seems they do not have enough energy to get through the barriers. D) Although it has been observed to occur, it violates all other known laws of nature, and explaining it therefore represents a major challenge to physicists. E) A, B, and C are true, but D is not