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h Assertion and reason are false,, , , , , , , , , , , , , , , , , , , , Assertion: When lightning strikes, the, sound is heard a little after the flash is, , seen. A, , Reason: The velocity of light is greater, than that of the sound. J, , | Assertion: Two persons on the surface of, ' moon cannot talk to each other. f, , / Answer briefly., What is vibration? }, Give an example to show that Maa travels, faster than sound? p \ains, imcrease loudness of sound by four, , es, how much should the amplitude of, tion be changed?, , is an ultrasonic sound? &, ‘two differences between music and, , Reason: There is no atmosphere on moon. A 4, , are the hazards of noise pollution? £, , a Q. Whe, , os Se, , ane, after it is fi, they are sta, equal to 33, 2. A sound w, the velocit, 3. What is t, wave that, wavelengt}, A wave ¥, traveling a, wavelengtl, , —, =, , 1. The every, by Bejami, 2. Vibration
