What is / are not true among the following?
(i) Audible range of sound for human beings is approximately 20 Hz to 10 kHz.
(ii) Sound waves with frequencies higher than 10 kHz are called ultrasound.
(iii) In earthquake, ultrasounds are produced before main shock waves.
1
(i) and (ii)
2
(i) and (iii)
3
(i), (ii) and (iii)
4
Only (iii)