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Sahay Sir > Question Answers > AIIMS Last 24 Years Solved 1996 - 2019 Physics and Chemistry Video Solutions > Physics > Chapter 16 - Waves > Two whistles A and B have frequencies 660 Hz and 590 Hz respectively. An observer is standing in the middle of line joining the two sources. Sources B and observer are moving towards right with velocity 30 m/s and A is standing to the left side. If the velocity of sound in air is 300 m/s. The number of beats per second listened by the observer are

Two whistles A and B have frequencies 660 Hz and 590 Hz respectively. An observer is standing in the middle of line joining the two sources. Sources B and observer are moving towards right with velocity 30 m/s and A is standing to the left side. If the velocity of sound in air is 300 m/s. The number of beats per second listened by the observer are

An observer moves towards a stationary source of sound with a velocity one-fifth of the velocity of sound. What is the percentage increase in the apparent frequency?