Answer very briefly II — task. Science State Board, Class 10.

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1. What will be the frequency sound having $0.20$ $m$ as its wavelength, when it travels with a speed of $331$ $m/s$ ?

The formula to find the frequency is

$b = \frac{v}{t}$
$f = \frac{v}{λ}$

The frequency is .

2. Name two animals, which can hear ultrasonic vibrations.

Pick an animal which can hear ultrasonic vibration in the following

a.

b.

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