15 solutions available
Question 6The frequency of violet light is 7.5 x 1014 Hz. Its wavelength in nm is :7500 nm4000 nm400 nm750 nm
Question 9Assertion (A): A beam of white light gives a spectrum on passing through a hollow prism.Reason (R): The speed of light outside the prism is...
Question 1Calculate the frequency of yellow light of wavelength 550 nm. The speed of light is 3 x 108 m s-1.
Question 2The frequency range of visible light is from 3.75 × 1014 Hz to 7.5 × 1014 Hz. Calculate its wavelength range. Take speed of light = 3 x 108...
Question 10How would the dispersion of light change if the prism is submerged in water instead of air ? Will the spread of the constituent colours...
Question 11Name two properties of ultraviolet radiations which are similar to the visible light and two which differ from visible light.
Question 12Mention two properties of infrared radiations which are similar to the visible light and two which differ from visible light.
Question 13State one harmful effect each of the (a) ultraviolet and (b) infrared radiations.
Question 14Give reason for the following:(i) Infrared radiations are used for photography in fog.(ii) Infrared radiations are used for signals during...
Question 15Radiations from the sun fall on a prism and suffer dispersion. Three thermometers are kept on which the radiations after dispersion are...
Question 3In the white light of Sun, maximum scattering by the air molecules present in the earth’s atmosphere is for —red colouryellow colourgreen...
Question 4Violet light is scattered nearly ............... times more than the red light.48169
Question 5How would the sky appear when seen from the space (or moon)? Give reason for your answer.
Question 7The colour of the sky, in direction other than of the Sun is blue. Explain.
Question 8Why does the Sun appear red at sunrise and sunset?