If the frequency of a given wave is decreased by a factor of four, how will its wavelength change?
A. The wavelength will increase by a factor of four.
B. The wavelength will remain unchanged.
C. The wavelength will decrease by a factor of four.
D. The change in wavelength is determined by the medium through which the wave is traveling.
Answer: A
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Rotational Kinetic Energy: A small ball is tied to one end of a light 2.5-m wire, and the other end of the wire is hooked to the ceiling. A person pulls the ball to the side until the wire makes an angle of 35° with the plane of the ceiling and then gently releases it. What is the angular speed of the ball, in rad/s, as it swings through its lowest point?
Fill in the blank(s) with the appropriate word(s).
Index of Refraction: When light travels from air into water,
A. its velocity, wavelength and frequency all change. B. its velocity changes, but its frequency and wavelength do not change. C. its frequency changes, but its velocity and wavelength do not change. D. its velocity and wavelength change, but its frequency does not change. E. its wavelength changes, but its velocity and frequency do not change.
Two speakers are placed side by side and driven by the same frequency of 0.50 kHz
If the distance from a person to one speaker is 5.0 m and the person detects little or no sound, which of the following is a possible the distance from the person to the other speaker? The sound speed in the room is 340 m/s. A) 7.7 m B) 8.1 m C) 8.4 m D) 9.1 m
What element is found in all life on Earth?
a. hydrogen b. iron c. carbon d. oxygen e. nitrogen