Radioactivity is a tendency for an element or a material to
A) emit radiation.
B) emit light.
C) emit electrons.
D) glow in the dark.
E) radiate heat.
Answer: A
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The mass of a body on the Moon is _______________ the mass of the same body on Earth
Fill in the blank(s) with correct word
In a spectrum chart (like the one shown in figure Q11.2), the emission lines produced by a quantum harmonic oscillator
A. Get closer together (in energy) as we go to the right.
B. Are evenly spaced (in energy).
C. Get farther apart (in energy) as we go to the right.
The center of our galaxy is 30,000 light years away. Could a person possibly travel there in her own lifetime?
A) No, because a person cannot travel at lightspeed. B) No, because the trip would take longer than 30,000 years, and nobody lives this long. C) No, because time dilation applies only to clocks and not to biological phenomena such as a person's lifetime. D) Yes, by traveling at nearly lightspeed, because of time dilation or the "relativity of time." E) Yes, by traveling faster than lightspeed, because of time dilation or the "relativity of time."
Light strikes a diamond (n = 2.42) at an angle of 60° relative to the normal to the surface. What is the angle of refraction?
a. 21° b. 30° c. 38° d. 69° e. 71°