Short answerEasy1 mark
The smoke from a fire looks white.
Topic: Electromagnetic spectrum / scattering
Previous-year question practice database
Answer
Exam answer
Smoke appears white because its particles scatter the different visible colours nearly equally.
Explanation
The smoke particles are large compared with visible wavelengths.
More from Spectrum
When a blackened bulb thermometer is moved beyond the red region of the visible spectrum, there is a rapid rise in the temperature. This is due to the presence of :
(a) Infrared radiations
(b) Ultraviolet radiations
(c) X-rays
(d) Radio waves2026Assertion (A) : Tiny air molecules scatter blue light more than red light.
Reason (R) : The refractive index of a medium is greater for blue light than red light.
(a) (A) is true but (R) is false.
(b) (A) is false but (R) is true.
(c) Both (A) and (R) are true and (R) is correct explanation of (A).
(d) Both (A) and (R) are true and (R) is not the correct explanation of (A).2026Name the electromagnetic radiation used to detect fake currency.2026Which one of the following combinations is the correct ascending order of electromagnetic waves in terms of wavelength?
(a) Gamma-rays, visible light, microwaves
(b) Microwaves, visible light, gamma-rays
(c) Gamma-rays, microwaves, visible light
(d) Microwaves, gamma-rays, visible light2025for which a quartz prism is used to study the spectrum.2025which are used in remote sensing devices.2025