Which of the following is correct regarding sound waves?
I. Compression – Region of high pressure
II. Rarefaction – Region of low pressure
Show answer & explanation
Correct answer: C
Explanation
Correct Answer: Option 3 (Both I and II)
Explanation:
Sound is a longitudinal wave that propagates through the vibration of particles in the medium. When sound travels through a medium (such as air), it produces changes in pressure and density, which can be explained in two ways:
Compression: This is the region where the particles of the medium are pushed closer together. This results in high pressure and high density.
Rarefaction: This is the region where the particles of the medium are spread apart. This results in low pressure and low density.
Additional Facts
Wavelength: The distance between two consecutive compressions or two consecutive rarefactions is called wavelength.
Medium: Sound requires a medium (solid, liquid, or gas) to travel. It cannot travel in a vacuum.
Speed: The speed of sound is highest in solids and lowest in gases.
Possible Questions for the Upcoming Exam
What is the unit for measuring sound intensity?
(Answer: Decibel - dB)
What is the range of audible frequencies for the human ear?
(Answer: 20 Hz to 20,000 Hz)
What is the frequency of ultrasonic waves?
(Answer: More than 20,000 Hz)