Heat is thermal energy that flows from
A) hot to cold.
B) high energy to low energy.
C) high thermal pressure to low thermal pressure.
D) all of the above
Answer: A
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A) 1.4 K B) 5,800 K C) about 3,000 K D) about 300 K E) just over 2.7 K
If the communication lifetime of civilizations in our galaxy is 10,000 years and our galaxy is 13 billion years old, what is the chance of us detecting another intelligent civilization now?
A) 1 in 13,000 B) 1 in 1,300,000 C) 1 in 1300 D) 1 in 130,000
The wavelength of a ruby laser is 694.3 nm. What is the energy difference between the two energy states for the transition that produces this light? (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A) 1.54 eV B) 1.65 eV C) 1.79 eV D) 1.81 eV
A wave travels an average distance of one meter in one second with a frequency of 1 hertz. Its amplitude is
A) less than 1 meter. B) 1 meter. C) more than 1 meter. D) need more information