18. Speed of sound in a gas is v and r.m.s. velocity of the gas molecules is c. The ratio of v to c is
(a) 3/λ (b) λ/3
(c) √3/λ (d) √λ/3
Answer-d
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a