Question

It takes 2 seconds for a second wave to travel between two fixed points when the day temperature is 10°C. If the temperature rises to 30°C, the sound wave travels between the same fixed parts in __________

(a) 1.9 sec

(b) 2 sec

(c) 2.1 sec

(d) 2.2 sec

The question was asked during an interview.

I would like to ask this question from Longitudinal Waves topic in portion Waves of Engineering Physics I

Answer 1

The correct option is (a) 1.9 sec

For explanation I would say: v∝1/√T  and t∝1/v

t2/t1 = √(T1/T2)=√((273+10)/(273+30))=√(283/303)

t2=√(283/303)×2s=1.9s.