Which of the following is based on photo electricity

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Exposure meter

Automatic doors

Reproduction of sound in movies

All the above

answer is D.

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Detailed Solution

A tool used to gauge the amount of light is called a light metre.

A laser beam is directed through the sound track and onto a photocell for sound reproduction. The photocell is then connected to a loudspeaker by an amplifier. The fundamental framework for sound reproduction in sound films is this optical system. A number of these bands may be utilized in stereophonic sound recording on the same movie.

A laser beam is directed through the soundtrack and onto a photocell for sound reproduction. The photocell is then connected to a loudspeaker through an amplifier. The fundamental framework for sound reproduction in sound films is this optical system. A number of these bands may be utilized in stereophonic sound recording on the same movie.

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