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The wave-function for a certain standing...

The wave-function for a certain standing wave on a string fixed at both ends is `y(x,t) = 0.5 sin (0.025pix) cos500t` where `x` and `y` are in centimeters and `t` is seconds. The shortest possible length of the string is :

A

126 cm

B

160 cm

C

40 cm

D

80 cm

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The correct Answer is:
C
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