A wave of frequency $$= 3$$ GHz, strikes a particle of size $$\left(\frac{1}{100}\right)^{th}$$ of $$\lambda$$, then this phenomenon is called as

A wave of frequency $$3$$ GHz strikes a particle of size $$\frac{1}{100}$$ of $$\lambda$$.

The wavelength of the wave is calculated by using $$\lambda = \frac{c}{f} = \frac{3 \times 10^8}{3 \times 10^9} = 0.1$$ m, which equals 10 cm.

The size of the particle is then found from $$\frac{\lambda}{100} = \frac{0.1}{100} = 0.001$$ m, corresponding to 1 mm.

When a wave encounters a particle whose size is much smaller than the wavelength ($$d \ll \lambda$$), the phenomenon is referred to as scattering.

Key distinctions:

- Diffraction occurs when the obstacle size is comparable to the wavelength ($$d \approx \lambda$$).

- Scattering occurs when the obstacle size is much smaller than the wavelength ($$d \ll \lambda$$).

- Reflection occurs when the obstacle size is much larger than the wavelength ($$d \gg \lambda$$).

Since the particle size is $$\frac{\lambda}{100}$$, which is much smaller than $$\lambda$$, the phenomenon in question is scattering.

Therefore, the correct answer is Option B.