Question

79) Before the main shock waves of an earthquake start,
the first sound waves produced by an earthquake are of
A) Either Low frequency infrasound or High frequency
ultrasound depending on the nature of earthquake
B) Audible range of frequency for human beings
C) Low frequency infrasound only
D)
High frequency ultrasound only​

Answer 1

Answer:

High frequency ultrasound only

Answer 2

Answer:

( A ) Part answer hai........