Two waves A and B have wavelengths 0.01 Å and 9000 Å respectively. The waves A and B are:

1. Gamma wave and ultraviolet wave respectively.
2. Microwave and infrared wave respectively.
3. Radiowave and gamma wave respectively.
4. Gamma wave and infrared wave respectively.

The correct arrangement of the following radiations in an increasing order of their wavelengths is :

X-rays, infrared rays, gamma rays, microwaves.

1. gamma rays, infrared rays, X-rays, microwaves
2. gamma rays, X-rays, microwaves, infrared rays
3. gamma rays, X-rays, infrared rays, microwaves
4. X-rays, gamma rays, infrared rays, microwaves

For obtaining the spectrum of ultraviolet radiation, the material of prism should be :

1. glass
2. quartz
3. rock salt
4. does not matter

A radiation P is focused by a proper device on the bulb of a thermometer. Mercury in the thermometer shows a rapid increase. The radiation P is —

1. infrared radiation
2. visible light
3. ultraviolet radiation
4. X-rays