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The vibrations from an 800 Hz tuning for...

The vibrations from an 800 Hz tuning fork set up standing waves in a string clamped at both ends. The wave speed in the string is known to be `400 m//s ` for the tension used. The standing wave is observed to have four antinodes. How long is the string?

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The correct Answer is:
A
`lambda = v/f = 0.5 m `

`l = 4(lambda/2) = 1m` .
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DC PANDEY-SUPERPOSITION OF WAVES-Level 1 Subjective
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