A small source radiates an electromagnetic wave with a single frequency into vacuum, equally in all directions. As the wave moves, its frequency:
1.increases.
2.decreases.
3.stays constant.
3
You might also like to view...
A 50.0-kg box is being pulled along a horizontal surface by means of a rope that exerts a force of 250 N at an angle of 32.0° above the horizontal. The coefficient of kinetic friction between the box and the surface is 0.350
What is the acceleration of the box? A) 0.638 m/s2 B) 1.74 m/s2 C) 3.16 m/s2 D) 6.31 m/s2 E) 8.53 m/s2
A damped oscillator is released from rest with an initial displacement of 10.00 cm. At the end of the first complete oscillation the displacement reaches 9.05 cm. When 4 more oscillations are completed, what is the displacement reached?
a. 7.41 cm b. 6.71 cm c. 6.07 cm d. 5.49 cm e. 5.25 cm
Time Dilation: A spaceship visits a star that is 4.5 light-years from Earth, and the spaceship travels at one-half the speed of light for the entire trip.(a) How long did the trip take according to an observer on Earth?(b) How long did the trip take according to an observer on the spaceship?
What will be an ideal response?
According to the laws of thermal radiation, hotter objects emit photons with
A) a lower average frequency. B) a shorter average wavelength. C) a lower average energy. D) a higher average speed.