a) the distance the wave moves in one second
b)the distance the wave moves in one time period of the wave
c)the maximum distance moved by the particles on either side of the mean (average) position
d)the distance equal to one wavelength
2) If you lower the frequency of a wave in a string you will?
a)lower its speed
b)increase its wavelength
c)lower its amplitude
d)shorten its period
b)the distance the wave moves in one time period of the wave
c)the maximum distance moved by the particles on either side of the mean (average) position
d)the distance equal to one wavelength
2) If you lower the frequency of a wave in a string you will?
a)lower its speed
b)increase its wavelength
c)lower its amplitude
d)shorten its period
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Ok, seriously--don't listen to those guys. I don't understand why people post answers that they really have no idea about. I mean, come on.
The answer to 1 is C.
A isn't anything. B is also the wavelength, which has nothing to do with the amplitude. The amplitude is the height of a crest or depth of a trough--or the maximum distance moved by the particles on either side of the average position. That's pretty much the straightforward definition and applies to all types of waves. The common 'height of a crest' only applies to transverse waves.
2) The answer is b.
The speed of a wave is a constant for a given type of wave in a given medium (in this case, a wave on a string). No matter *what* your frequency and your amplitude is, the speed of this wave is a constant, just like the speed of light in a vacuum is a constant no matter what the frequency or wavelength of that light is--it always moves at 3x10^8 m/s.
The speed of the wave= wavelength x frequency. Always. Thus, if you reduce the frequency, but the speed has to be the same, you have to increase the wavelength.
FYI, the speed of a wave on a string is equal to the square root of the tension in the rope over the rope's linear density (it's mass divided by it's length). Notice that it has nothing to do with the frequency or the wavelength.
The answer to 1 is C.
A isn't anything. B is also the wavelength, which has nothing to do with the amplitude. The amplitude is the height of a crest or depth of a trough--or the maximum distance moved by the particles on either side of the average position. That's pretty much the straightforward definition and applies to all types of waves. The common 'height of a crest' only applies to transverse waves.
2) The answer is b.
The speed of a wave is a constant for a given type of wave in a given medium (in this case, a wave on a string). No matter *what* your frequency and your amplitude is, the speed of this wave is a constant, just like the speed of light in a vacuum is a constant no matter what the frequency or wavelength of that light is--it always moves at 3x10^8 m/s.
The speed of the wave= wavelength x frequency. Always. Thus, if you reduce the frequency, but the speed has to be the same, you have to increase the wavelength.
FYI, the speed of a wave on a string is equal to the square root of the tension in the rope over the rope's linear density (it's mass divided by it's length). Notice that it has nothing to do with the frequency or the wavelength.
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1= c
2= c
2= c
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D
C
C