The distance between peaks on a wave divided by the time for the wave to travel this distance is the wave's
a. speed.
b. frequency.
c. wavelength.
d. amplitude.
e. loudness.
a
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In 1974, astronomers broadcasted a radio message of greeting towards the globular cluster M13, 25,000 light-years away
a. True b. False Indicate whether the statement is true or false
A tungsten filament is heated to 2700 K. At what wavelength is the maximum amount of radiation emitted? What fraction of the total energy is in the visible range (0.4 to 0.75 ?m)? Assume that the filament radiates as a gray body.
GIVEN
• Heated tungsten filament
• Filament temperature (Tf) = 2700 K
FIND
(a) Wavelength at which the maximum radiation is emitted (?max)
(b) Percentage of radiation in the visible ranger (0.4 to 0.75 ?m)
ASSUMPTIONS
• The filament radiates as a gray body
SKETCH
When a wheel is rolling without slipping, the magnitude of its velocity relative to the ground is greatest at
A. the point in contact with the ground. B. the point at the center of the wheel. C. the point at the top of the wheel opposite to the point in contact with the ground. D. the point farthest forward from the center of mass of the wheel. E. the point farthest behind the center of mass of the wheel.
A plane is moving due north, directly towards its destination. Its airspeed is 200 mph. A constant breeze is blowing from west to east at 42 mph. In which direction is the plane pointed?
a. 5.7° W of N c. 22° W of N b. 12° W of N d. 11° E of N