Question $5(1$ point$)$

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The wavelength in air $($temperature of $20C)$ of a sound wave of frequency $0\mathrm{.}50$ kHz is

$0\mathrm{.}68$ m

$1\mathrm{.}5$ m

$0\mathrm{.}75$ m

$1\mathrm{.}8$ m

$2\mathrm{.}0$ m