The force of gravity acts on all apples on an apple tree. Some apples are twice as far from the ground as others. For the same mass these twice-as-high apples have
A) 1/4 the weight.
B) 1/2 the weight.
C) practically the same weight.
Answer: C
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Which of the following statements is true?
A. Even though X-rays have higher energy, they move with the same speed as that of visible light. B. X-rays have higher energy, but still they move slower than visible light. C. X-rays have higher energy, hence they move faster than visible light. D. None of these choices are correct.
Nuclear reactors that produce consumer power in present times are powered by
A) fission. B) fusion. C) both fission and fusion.
The expression(s) indicating the atomic number of a nucleus is
a. A b. N c. Z d. Z + N e. A – Z
Which of the following statements is false? a. The angle ? in Snell's law is measured between the ray and a line perpendicular to the surface. b. Photons of blue light have a higher energy than photons of red light
c. A photon's energy depends on its brightness. d. The ratio v/? of a photon's speed to its wavelength has the same value for any index of refraction n.