Question

Q. Name the following.

1) Device used to observe the object on the ground from an underwater submarine

2) Reverberation in public halls, an auditorium,movie halls is reduce by.​

Answer 1

Answer:

Ans 1 - A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position.

Ans 2 - The roof and walls of the auditorium or cinema hall are generally covered with sound absorbent materials like draperies or compressed fibreboard to reduce reverberation. These materials reduce the formation of echoes by absorbing sound waves.

Answer 2

Answer:

1.periscope

2.draperies,compressed fiberboard

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