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

Low work function
High melting point
Low melting point
Low resistance

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Steel can be saved
Accidents due to expansion in summer can be avoided
Air-gaps are necessary for bearing the weight of running train
Accidents due to contraction in winter can be avoided

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