Frequency more than 20,000 HZ​

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Explanation:

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The units of frequency are called hertz (Hz). Humans with normal hearing can hear sounds between 20 Hz and 20,000 Hz. Frequencies above 20,000 Hz are known as ultrasound

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach