a) What are infrared rays? What is the range of wavelengths of infrared rays in Å?
b) State four important properties and four uses of infrared rays.
a) What are infrared rays? What is the range of wavelengths of infrared rays in Å?
b) State four important properties and four uses of infrared rays.
Step1:
(a) Infrared rays:- infrared radiation, that portion of the electromagnetic spectrum that extends from the long wavelength, or red, end of the visible-light range to the microwave range. Invisible to the eye, it can be detected as a sensation of warmth on the skin.
The range of wavelengths of infrared rays in Å is 106 - 7000 Å.
Step2:-
(b) Four important properties of infrared rays:-
1. l.R. rays are least scattered by fog, mist, etc. as they have long wavelength.
2. They can be detected by a thermopile or a thermometer with a blackend bulb, as they produce heating effect.
3. They travel with vel. of light i.e. 3 × 108ms-1
4. They are electromagnetic wave and hence are not affected by electromagnetic fields.
Four uses of infrared rays :
1. They are used to detect disease in crops which are used to find any change in heat radiation pattern and help in early warning to save crops.
2. Patients with swollen joints, muscles, etc. feel relieved when exposed to these radiations.
3. These are used in night vision devices.
4. They are used in surface to air missiles for tracking and destroying enemy planes.
Step1:
(a) Infrared rays:- infrared radiation, that portion of the electromagnetic spectrum that extends from the long wavelength, or red, end of the visible-light range to the microwave range. Invisible to the eye, it can be detected as a sensation of warmth on the skin.
The range of wavelengths of infrared rays in Å is 106 - 7000 Å.
Step2:-
(b) Four important properties of infrared rays:-
1. l.R. rays are least scattered by fog, mist, etc. as they have long wavelength.
2. They can be detected by a thermopile or a thermometer with a blackend bulb, as they produce heating effect.
3. They travel with vel. of light i.e. 3 × 108ms-1
4. They are electromagnetic wave and hence are not affected by electromagnetic fields.
Four uses of infrared rays :
1. They are used to detect disease in crops which are used to find any change in heat radiation pattern and help in early warning to save crops.
2. Patients with swollen joints, muscles, etc. feel relieved when exposed to these radiations.
3. These are used in night vision devices.
4. They are used in surface to air missiles for tracking and destroying enemy planes.
