A man stands stationary in front of a swing. A child sits and swings.
The child blows a whistle that emits a sound at a constant frequency.
The man observes the frequency of the sound when the swing is at positions X, Y and Z.
When will the man hear the highest frequency?
1 )
when the swing is at X
2 )
when the swing is at Y and moving away from the man
when the swing is at Y and moving towards the man
4 )
when the swing is at Z
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