You are driving along a highway at 25.0 m/s when you hear the siren of an emergency vehicle traveling in the opposite direction on the other side of the highway
When the vehicle is approaching you, you hear the frequency of the siren as 2380 Hz, but when it is past you the frequency becomes 1680 Hz. What is the frequency of the siren? The speed of sound in air is 343 m/s. A) 1850 Hz
B) 2000 Hz
C) 2050 Hz
D) 2010 Hz
E) 1980 Hz
B
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Waves from a radio station with a wavelength of 644 m arrive at a home receiver a distance 50 km away from the transmitter by two paths. One is a direct-line path and the second by reflection from a mountain directly behind the receiver. What is the minimum distance between the mountain and receiver such that destructive interference occurs at the location of the listener? Assume no phase change
on reflection. a. 161 m b. 322 m c. 483 m d. 644 m e. 1290 m
An ideal Carnot air conditioner operates between an indoor temperature of 20°C and an outdoor temperature of 39°C. How much energy does it use to remove 2000 J of heat from the interior of the house?
A) 105 J B) 130 J C) 780 J D) 520 J E) 340 J
Fragments of rocks formed due to erosion settle out to form layers of
A) sediment B) precipitate C) deposit D) residuum
Young's double slit experiment relies on the ___________________ of light.
A: Dampening B: Interference C: Refraction D: Reflection