# (a.) A motorcyclist travels at a constant speed of 72 km/h along a straight level road towards anobserver standing at the center of the bridge over the road. When the motor-cyclist is distant, theobserver hears a sound of frequency 65,0 //z from the engine of the motorcycle. (b.) A second motor-cyclist now rides along-side the one mentioned in (b), at the same constantspeed of 72 km/h. The frequency of the sound of the second motorcycle is lower than that of thefirst motorcycle. When the two machines are traveling towards the observer, from the samedirection, the intensity of the sound received varies with a frequency of 3.0 Hz.Name the effect causing the variation of sound intensity and explain how it arises in this case. Whatwould be the frequency of the variation of sound intensity after the motor-cycles have passed underthe bridge and are moving away from the observer?

(a.) A motorcyclist travels at a constant speed of 72 km/h along a straight level road towards anobserver standing at the center of the bridge over the road. When the motor-cyclist is distant, theobserver hears a sound of frequency 65,0 //z from the engine of the motorcycle. (b.) A second motor-cyclist now rides along-side the one mentioned in (b), at the same constantspeed of 72 km/h. The frequency of the sound of the second motorcycle is lower than that of thefirst motorcycle. When the two machines are traveling towards the observer, from the samedirection, the intensity of the sound received varies with a frequency of 3.0 Hz.Name the effect causing the variation of sound intensity and explain how it arises in this case. Whatwould be the frequency of the variation of sound intensity after the motor-cycles have passed underthe bridge and are moving away from the observer?

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