State how many laws are in reflection of sound and its applications.

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2 and megaphone, soundboard, stethoscope

3 and megaphone, soundboard, stethoscope

2 and hearing aid

1 and 3

answer is D.

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Detailed Solution

“The angle of incidence is always equal to the angle of reflection”.
All three types of sound—reflection, incident, and natural sound—belong in the same plane.
The megaphones, which resemble horn-shaped tubes, help to reduce repeated reflections and echoes while speaking. The soundboards are concave, curved planks. These are utilized for the audience's comfort who are present in the auditorium, seminar room, etc. These are often situated across from the speakers. One well-known piece of diagnostic gear is the stethoscope. It is utilised, as we are all aware, to discern the location of an organ within the human body. It also operates on the idea of sound reflection. With the use of the tube, the sound absorbed from the chest can be sent to the ears. A hearing aid is a tool used by those who have hearing loss. Here, the hearing aid picks up the sound waves, which are then reflected in a smaller space connecting to the ear.

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