Physics · 2021
JEE Main · 4 August 2021, Shift 1 · Q1
A wave of wavelength 0.75 cm is produced in air and travels at a speed of 300 m / s. Which of the following is most appropriate option?
A wave of wavelength $\displaystyle 0.75$ cm is produced in air and travels at a speed of $\displaystyle 300 \mathrm{~m} / \mathrm{s}$. Which of the following is most appropriate option ?
Official answer
(4)
It is an ultrasonic wave and It is not audible both are correct.
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JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.