Q)
Sonia was watching a movie, in which he saw the automatic opening of a garage door. She was fascinated about this and asked her brother to explain about this. Even though her brother did not know much about this he decided to learn about this and explain it to Sonia. He came to know about the photoelectric effect in the automatic opening of the door. He explained about this in detail to Sonia. She thanked him for this.
a) What are values of Sonia’s brother in enlightening her about the subject?
b) How is photoelectric effect involved in the automatic opening of the garage door?
c) Why alkali metals are most suitable for photoelectric emission?
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