A boat is fitted with an echo-sounder, which uses ultrasound with a frequency of 40 KHz.(i) What is the frequency of the ultrasound in Hz?(ii) If ultrasound pulses take 0.03 s to travel from the boat to the seabed and return,how deep is the water under the boat.(iii) What is the wavelength of ultrasound in water?
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Its frequency is 40000 hz
wavelength=speed/frequency
=1531/0.03
=51033.33 metres
wavelength=speed/frequency
=1531/0.03
=51033.33 metres
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