Physics
Why does'nt the hydrogen atom emit X-rays?

It is very small in size
It has only one electron
It is highly electropositive
Its energy levels are very close to each other

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Physics
A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by

None of these
Decreasing the radius of the capillary tube
Increasing the height of water in the vessel
Increasing the radius of the capillary tube

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Physics
Rainbow is due to

refraction and reflection of sunlight by water droplets
absorption of sunlight in minute water droplets
diffusion of sunlight through water droplets
ionisation of water deposits

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