" Linkage decreases frequency of "

Linkage deecrease the frequency of

Linkage deecrease the frequency of

Linkage reduces the frequency of

Linkage reduces the frequency of:

When the electromagnetic wave enters into a medium from free space, (A) Velocity of the wave decreases (B) Frequency of the wave decreases (C) Wavelength of the wave decreases (D) Frequency increase and wavelength decreases

If the tension in a wire is decreased by 9% , then the percentage decrease in frequency will be