A neon light (thin hot neon gas in a sealed tube) gives us:
A) a continuous spectrum, since the neon is hot enough to glow.
B) a few bright emission lines, telling us the gas is neon.
C) a continuum, with dark lines identifying the neon atoms that are present.
D) a lot of random bright red lines due to the motion of the hot atoms.
E) nothing visible to us, but a lot of infrared lines as heat.
B
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Estimation: A marathon race is 26 mi and 385 yd long. Estimate how many strides would be required to run a marathon. Assume a reasonable value for the average number of feet/stride.
A. 4.5 × 104 strides B. 4.5 × 103 strides C. 4.5 × 105 strides D. 4.5 × 106 strides
Which statement regarding Einstein's theories is correct?
a. According to special relativity, moving clocks run more slowly than those at rest, and according to general relativity, clocks higher in a gravity field run more quickly. b. According to special relativity, moving clocks run more quickly than those at rest, and according to general relativity, clocks higher in a gravity field also run more quickly. c. According to special relativity, moving clocks run more quickly than those at rest, and according to general relativity, clocks higher in a gravity field run more slowly. d. According to special relativity, moving clocks run more quickly than those at rest, and according to general relativity, clocks higher in a gravity field also run more quickly.
Where have scientists begun a concerted search for life outside of Earth?
A) the Moon B) Venus C) Mars D) Jupiter E) Titan
The relative humidity is 100% at the ______________ temperature
Fill in the blank(s) with correct word