Question

The back and forth vibration of a metal strip in air _____.

• A. create compressions and rarefactions
• B. create alternate low and high pressure regions
• C. creates only high pressure region
• D. create crests and troughs

Answer 1

Answer: (A), (B)

The correct options are
A

create compressions and rarefactions

B

create alternate low and high pressure regions

The back and forth vibration of a metal strip in air create compressions and rarefactions which are the regions of high and low pressure respectively. The low and high pressure region is created due to air molecules coming close and moving far from each other. Following image explains the high and low density of air molecules leading to compression and rarefaction in air.