16
(a) Explain the Tyndall effect with the help of one suitable example.
(b) What happens when a white light gets scattered from (i) very fine particles (ii) larger size particles ?
(b) What happens when a white light gets scattered from (i) very fine particles (ii) larger size particles ?
Show SolutionHide Solution↓
(a) • When a beam of light strikes fine particles like smoke, tiny water droplets, suspended particles of dust and molecules of air, the path of beam becomes visible. This phenomenon of scattering of light by colloidal particles is called Tyndall effect. (1 Mark)
• Examples: -
➤ When sunlight passes through a canopy of a dense forest tiny water droplets in the mist scatter light. (1 Mark)
➤ When a fine beam of sunlight enters a smoke-filled room through a small hole, scattering of light makes the particles visible.
(Any one, any other suitable example)
(b) (i) Blue light / light of shorter wavelength is visible. (½ Mark)
(ii) Red light/ Light of longer wavelength is visible. (½ Mark)
• Examples: -
➤ When sunlight passes through a canopy of a dense forest tiny water droplets in the mist scatter light. (1 Mark)
➤ When a fine beam of sunlight enters a smoke-filled room through a small hole, scattering of light makes the particles visible.
(Any one, any other suitable example)
(b) (i) Blue light / light of shorter wavelength is visible. (½ Mark)
(ii) Red light/ Light of longer wavelength is visible. (½ Mark)