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21 February, 08:43

The linear density of a string decreases by 1/4 when it is stretched. What happens to the speed of a wave on the string?

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  1. 21 February, 09:00
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    The speed doubles.

    Explanation:

    The speed of a wave in a string is:

    v = √ (T / ρ)

    where T is the tension and ρ is the linear density (mass per length).

    If T is held constant, and ρ decreases by 1/4, then:

    v = √ (T / (ρ/4))

    v = √ (4T / ρ)

    v = 2√ (T / ρ)

    The speed doubles.
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