If the frequency of a sound wave is reduced to half of its original value, then the speed of sound wave will:
 

Answer: [A] reduce to half of its original value

The frequency and wavelength formulas of sound waves is given as follows:
http://www.gktoday.in/wp-content/uploads/2016/02/speed-frequency-wavelength.jpg
In the above, Greek letter lambda λ is the symbol for wavelength.

This question is a part of GKToday's Integrated IAS General Studies Module