A stretched string is observed to have four equal segments in a standing wave driven at a frequency of 480 Hz. What driving frequency will set up a standing wave with five equal segments?
A) 240 Hz B) 600 Hz C) 360 Hz D) 120 Hz
B
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A metallic sheet has a large number of parallel slits, 5.0 mm wide and 20 cm apart. This sheet is used as a grating for microwaves
A wide parallel beam of microwaves is incident normally on the sheet. If the microwave wavelength is 6.0 cm, what is the largest angle from the normal, at which an intensity maximum occurs? A) 64° B) 69° C) 74° D) 79° E) 84°
Three Carnot engines operate between temperature reservoirs as follows: Engine A: Th = 1300 K, Tc = 1000 K; Engine B: Th = 1000 K, Tc = 700 K; Engine C: Th = 500 K, Tc = 350 K. Which two engines have the same thermal efficiency?
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