Question

Mention two properties of a wave; the property which varies and the other which remains constant when a wave passes from one medium to another.

• A. Property which varies: Speed (or velocity) and Wavelength
  Property which remains constant: frequency
• B. Property which varies: Speed (or velocity) and frequency
  Property which remains constant: Wavelength
• C. Property which varies: Wavelength and frequency
  Property which remains constant: Speed or velocity
• D. Property which varies: Wavelength
  Property which remains constant: Speed or velocity and frequency

Answer 1

The correct option is A

Property which varies: Speed (or velocity) and Wavelength
Property which remains constant: frequency

v = f * λ. Now, v and λ vary when a wave moves from one media to another. But frequency remains constant as it is the characteristic of the source which produces the sound.