Ultrasounds are low-frequency waves.

True

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False

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Solution

The correct option is B
False

Ultrasounds are high-frequency waves. They have frequencies higher than the upper audible limit of human hearing. Ultrasound is not different from audible sound in its physical properties, except in that humans cannot hear it.

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No.	Column 1	Column 2	Column 3
1.	Transverse wave	(a) Particles oscillate parallel to direction of propagation	(i) Waves produced in slinky.
2.	Longitudinal waves.	(b) Particles oscillate perpendicular to direction of propagation	(ii) Frequency less than 20 Hz.
3.	Ultrasound.	(c) Echo formation is heard under particular conditions.	(iii) Waves produced in string
4.	Infrasound	(d) High frequency waves.	(iv) Frequency between 20 Hz and 20000 Hz.
5.	Audible frequency	(e) Low frequency waves	(v) Frequency greater than 20000 Hz.

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