Which of the following is produced by the thermal vibrations of molecules?
A) shock waves
B) visible
C) pressure waves
D) ultra-violet
E) infra-red
E
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Which force field can both accelerate an electron and change its speed?
A) electric field. B) magnetic field. C) both of these D) none of the above
If the source moves, the wavelength of the sound in front of the direction of motion is smaller than the wavelength behind the direction of motion
a. True b. False Indicate whether the statement is true or false
In the Doppler effect it is important to distinguish between
A) frequency and speed. B) speed and velocity. C) speed and acceleration. D) distance and displacement.
Suppose your normal resting heart rate is 60 beats per minute. Now, suppose you board a spaceship that travels away from Earth at 90% of the speed of light. While on the ship, you measure your heart rate. What will it be?
A) It will still be 60 beats per minute. B) It will be 46 beats per minute. C) It will be 74 beats per minute. D) It will be 12 beats per minute.