Two cars are approaching each other at an equal speed of 7.2 km/hr. When they see each other

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Two cars are approaching each other at an equal speed of 7.2 km/hr. When they see each other, both blow horns having frequency of 676 Hz. The beat frequency heard by each driver will be ….. Hz [Velocity of sound in air is 340 m/s.]
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Sep
Two cars are approaching each other at an equal speed of 7.2 km/hr. When they see each other, both blow horns having frequency of 676 Hz. The beat frequency heard by each driver will be ….. Hz [Velocity of sound in air is 340 m/s.] both blow horns having frequency of 676 Hz. The beat [...]
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