One light-year is the distance light travels in one year. The speed of light is about 300,000 km/s . How far is 1 light-year?
A) 1.08 billion km (1,080,000,000, or 1.08 × 109 km)
B) 300 thousand km (300,000, or 3 × 105 km)
C) 9.46 trillion km (9,460,000,000,000, or 9.46 × 1012 km)
D) 18 million km (18,000,000, or 1.8 × 107 km)
C
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Determine the average kinetic energy per atom due to thermal vibrations in a solid at 1000 K. You can assume that the heat capacity at constant volume for the solid is equal to the classical limit of 3R for all temperatures, and that the material is at constant volume during heating. Express your answer in eV/atom.
What will be an ideal response?
The prediction from special relativity that the length of a moving object will be shortened in the direction of motion is called __________
Fill in the blank(s) with correct word
A Doppler red shift indicates
a. a shift toward lower frequencies. b. a shift toward longer wavelengths. c. that a light source is receding relative to the observer. d. all of these.
A heat engine ________
a. converts work into heat energy b. needs a temperature difference to be able to work c. can be 100% efficient in the absence of friction d. needs electricity to be able to run