Explain wavelength and frequencies ranges of different regionsin the spectrum?

Explain the term Critical frequency

Explain different types of niche

An observer moves towards a stationary source of sound with a speed 1//5^(th) of the speed of sound. The wavelength and frequency of the source emitted are X and f respectively. The apparent frequency and wavelength recorded by the observer are respectively

A light of wavelength 5000 A. is incident on a water surface of refractive index (4/3) . Find the wavelength and frequency of light in water if its frequency in air is 6 x 10^14 Hz .

Explain briefly the different types of fossils.

Determine the wavelength and frequency of a photon having energy of 3.2 eV

Explain different physical changes of adolescence.

Explain the role of the different photosynthetic pigment.

State and explain the different categories of species.