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The wave fronts of a standing wave on a string travel at a speed: a) Equal...

The wave fronts of a standing wave on a string travel at a speed:


a) Equal to that of a traveling wave of the same string.
b) Greater than that of a traveling wave on the same string
c) that depends on the amplitude of the wave
d) that depends on the wavelength of the wave
e) equal to zero

A speaker is placed next to one end of tube opened at both ends. The frequency of the sound wave is set to 700hz and a standing wave is observed. the air temp is such that the speed of the sounds is 350 m/s. The distance between adjacent nodes of the standing wave equals___ meters.
a) 1/4
b)1/2
c)1
d)2
e)0.7

Please explain why for 2nd question. thanks.

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