Mercury sol is obtained by subjecting it to sound waves of frequency more than ………..
A. 20 Hz
B. 20 kHz
C. 200 kHz
D. 2000 kHz
Answer:B
Mercury sol is obtained by subjecting it to sound waves of frequency more than ………..
A. 20 Hz B. 20 kHz C. 200 kHz D. 2000 kHz