Question

1. Define efflorescence?

Physics:-
1. Find new resistance of wire if it is stretched to twice its original length. Original resistance was 20 ohm. Also how its resistivity will change.

2. Find new resistance of wire which is doubled on itself. If original resistance of wire is 50 ohm.
3. Explain working of bulb and fuse.

Answer 1

efflorescence is the property of some salts to lose wholly or partly their water of crystallisation when their crystals are exposed to dry air even for a short time
----------------------------------------------------------------------------------------------------
if it helped you, mark it as brainliest
----------------------------------------------------------