PUMPA - SMART LEARNING
எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்
Book Free Demo1. The rapid back and forth motion of a particle about its mean position is called.
2. If the energy in a longitudinal wave travels from south to north, the particles of the medium would be vibrating in .
3. A whistle giving out a sound of frequency 450 Hz, approaches a stationary observer at a speed of 33 m/s. The frequency heard by the observer is (speed of sound = 330 m/s) .
4. A source of sound is travelling with a velocity 40 km/h towards an observer and emits a sound of frequency 2000 Hz. If the velocity of sound is 1220 km/h, then the apparent frequency heard by the observer is .
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