A floating leaf oscillates up and down two complete cycles in one second as a 10-meter long water wave passes by. What is the wave's speed?
A) 2 m/s
B) 10 m/s
C) 20 m/s
D) 40 m/s
E) more than 40 m/s
Answer: C
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A guitar string is fixed at both ends. If you tighten it to increase its tension
A) the frequencies of its vibrational modes will increase but its wavelengths will not be affected. B) the wavelength increases but the frequency is not affected. C) both the frequency and the wavelength increase.
Since the mass of an object is the same for all observers, it is a relativistically ____________ quantity
Fill in the blank(s) with correct word
The "seeing ability" or resolution of radiation is determined by its wavelength. If an atom is approximately 10-10 m in diameter, how fast must an electron travel to have a wavelength smaller than the size of an atom?
The average temperature of the typical dark dust cloud is about
A) 0 K. B) 2.73 K. C) 100 K. D) 3,000 K. E) 6,000 K.