Assertion (A) : Ultraviolet radiations are scattered more as compared to the microwave radiations.

Reason (R) : Wavelength of ultraviolet radiation is more than the wavelength of microwave radiation.

1. Both A and R are true.
2. A is true but R is false.
3. A is false but R is true.
4. Both A and R are false.

A is true but R is false.

Explanation

Assertion (A) is true: Scattering of light is inversely proportional to the fourth power of its wavelength (Scattering ∝ $\dfrac{1}{\text λ^4}$)

Since ultraviolet radiation has shorter wavelength than microwave radiation which implies ultraviolet radiations will be scattered more than microwave radiation.

Reason (R) is false: Ultraviolet radiation has a much shorter wavelength (around 10–400 nm) than microwaves (which have wavelengths in the millimeter to centimeter range, i.e., 1 mm to 1 m).