The energy transported by a wave is proportional to the amplitude of the wave
Indicate whether the statement is true or false
FALSE
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_________emission occurs when a material is heated to a high temperature and electrons are emitted.
Fill in the blank(s) with the appropriate word(s).
In a system of N gas molecules, the individual speeds are v1, v2, ..., vN . The rms speed of these molecules is:
A. 1 N ?v1 + v2 + ... + vN B. 1 N v2 1 + v2 2 + ... + v2 N C. (v2 1 + v2 2 + ... + v2 N )/N D. [(v1 + v2 + ... + vN )/N] 2 E. 0(v1 + v2 + ... + vN )2/N
A sports car and a moving van move at the same speed when they crash into a cement wall and stop equally quickly. The vehicle to have the greater force of impact will be
1) the sports car, 2) the van, 3) neither, for they experience equal forces of impact because 4) they are traveling at the same speed. 5) the van's momentum is much greater. 6) the sport car has a greater change in velocity upon impact. 7) they both have equal momentum.
A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. The count rate 24 minutes later is 1,000 counts per minute. The half-life of the radioisotope is __________
Fill in the blank(s) with correct word