A source of sonic oscillations with frequency `v_(0)=100Hz` moves at right angles to the wall with a velocity `u=0.17 m//s`. Two stationary receivers `R_(1)` and `R_(2)` are located on a straight line, coinciding with the trajectory of the source , in the following succession :` R_(1)-` source `-R_(2)-` wall. Which receiver registers the beatings and what is the beat frequency ? The velocity of sound is equal to `upsilon= 340 m//s`.

Explanation

To solve the problem step by step, we need to analyze the situation involving the source of sound, the receivers, and the wall. The source is moving at right angles to the wall, and we need to find out which receiver registers the beat frequency and what that frequency is.

### Step 1: Determine the frequency heard by Receiver R1
- The source of sound is moving with a frequency \( v_0 = 100 \, \text{Hz} \).
- The speed of sound in air is \( \upsilon = 340 \, \text{m/s} \).
- The velocity of the source is \( u = 0.17 \, \text{m/s} \).
- Since R1 is located in the direction of the source's movement, we can use the Doppler effect formula for a source moving towards a stationary observer:

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