Name the wave which is used for taking photographs in the dark.
Which of the following are the properties of infrared radiation?
It is visible to human eyes.
They produce strong heating effect.
It is invisible to human eyes.
They do not produce any heating effect.
The radiation 'P' is founded by a proper device on the bulb of a thermometer. Mercury in the thermometer shows a rapid increase. Name the radiation P.
Which of the electromagnetic rays produce a high heating effect?
- Gamma rays
- Infrared rays
- Visible rays
- Ultraviolet rays
What are infrared radiations ? How are they detected ? State one uses of these radiations.
Give two properties of infrared radiations which differ front the visible light.
Name two sources, each of infrared radiations and ultraviolet radiations.
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 :
(a) infrared radiation
(b) visible light
(c) ultraviolet radiation
(d) X -rays.