1.

Ryan while verifying the laws of reflection of sound measured the anglebetween the incident sound wave & reflected sound wave to be 1300.What is the angle of incidence? Draw the diagram showing inci dentsound wave, reflected sound wave and the angle of incidence.

Answer»

Since the normal makes an angle of 90 with the plain.Therefore,Let angle between incident ray and plain be X.=> angle of incidence=(90-X)=> angle of refraction=(90-X)According to question:90-x+ 90-x=130=>180-2x=130=>2x=50=x=25.



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