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Question : 27 of 100
Marks:
+1,
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Solution:
The correct answer is option4i.
eInfrared waves. Infrared wave is an electromagnetic wave.- It was discovered by Willam Herschel.
- Infrared waves are used by the common TV remote control.
- Waves used in distant photography.
- Invisible to the human eye.
- Most of the thermal radiation emitted by objects near room temperature is infrared.
- Used for target acquisition purposes in military and civilian applications.
- Wavelength: 700 nanometers to 1 millimeter.
- The heat of the sunlight is due to Infrared rays.
| Radio waves | ● Electromagnetic wave with
maximum wavelength.
● Wavelength: 1 meter to 100,000 km
● Waves used in radio and television broadcasting.
●Radio waves were first predicted by
James Clerk Maxwell. |
| Lasers | ●LASER stands for Light Amplification by Stimulated Emission of Radiation.
●Source of intense monochromatic light.
Discovered by
Theodore Maiman.
●Used in medical fields to perform minute operations. |
| Ultrasonic waves | ● Sound waves
produced by Bats.
●Sound higher than 20000 Hz.
●Inaudible sound for humans.
●Used in ultrasound scanning. |
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