# NEET Physics Waves Questions Solved

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A source and listener are both moving towards each other with speed v/10, where v is the speed of sound. If the frequency of the note emitted by the source is f, the frequency heard by the listener would be nearly

(1) 1.11 f

(2) 1.22 f

(3) f

(4) 1.27 f

(2) When source and listener both are moving towards each other then, the frequency heard

${n}^{\text{'}}=n \left(\frac{v+{v}_{O}}{v-{v}_{S}}\right)$${\text{n}}^{\text{'}}=f \left(\frac{v+v/10}{v-v/10}\right)=1.22 f.$

Difficulty Level:

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