Question

As the frequency of a wave decreases, the wave's -

period decreases
speed decreases
wavelength increases
amplitude increases

Answer 1

wavelength increases, because when frequencies are decreased, wavelengths become longer.

Answer 2

Wavelength increases.

Step-by-step explanation:

The Speed of a wave is given by the product of its frequency and wavelength.

i.e ν = fλ, where ν is the wave speed, f is the wave's frequency, and λ is the wavelength.

So for the speed to have a constant value at an instance, then if the frequency decreases, the wavelength will increase and vice versa.