Physics
For photoelectric effect to take place, the metal used as the cathode should have ________

Low melting point
Low work function
High melting point
Low resistance

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Physics
It is dangerous to observe Solar eclipse with naked eyes because

Cosmic rays reach eyes more during the eclipse
All radiations from sun initiate chemical reactions in eyes
Infrared radiations from sun burn our retina
Ultraviolet radiations from Sun burn our retina

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