Question

The given plot represents the change in density of the particles as sound travels through a medium. Which of the following statements is/are correct with respect to corresponding pressure-distance graph?

• A. Region A will be represented as a crest.
• B. Region B will be represented as a trough.
• C. Region A will be represented as a trough.
• D. ​​​​​​Region B will be represented as a crest.

Answer 1

Answer: (C), (D)

The correct options are
C Region A will be represented as a trough.
D ​​​​​​Region B will be represented as a crest.

​​​​​It can be noticed that the number of particles in region A is less than that of the region B. So, region A is a low pressure region (due to relatively fewer number of molecules) and B is a high pressure region (due to relatively higher number of molecules). Hence, region A will be marked by a trough and region B will be marked by a crest.