According to the inverse square law of light, how will the apparent brightness of an object change if its distance to us triples?
A) Its apparent brightness will decrease by a factor of 3.
B) Its apparent brightness will increase by a factor of 9.
C) Its apparent brightness will increase by a factor of 3.
D) Its apparent brightness will decrease by a factor of 9.
D
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You stand by the railroad tracks as a train passes by. You hear a 1 020-Hz frequency when the train approaches, which changes to 760 Hz as it goes away. How fast is the train moving? The speed of sound in air is 340 m/s
a. 30.2 m/s b. 34.5 m/s c. 40.1 m/s d. 49.7 m/s e. 45.6 m/s
Fourier discovered that music can be
A) a series of non-periodic waves. B) reduced to simple sine waves. C) a binary code. D) pulses of the same amplitude.
Resistors in Combination: What resistance must be connected in parallel with a 633-? resistor to produce an equivalent resistance of 205 ??
Fill in the blank(s) with the appropriate word(s).