Laser ,Types and Use

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  LASER :-                    LASER is an acronym of  Light Amplification by stimulated emission of Radiation. It is an optical device which produces an intensive beam of highly coherent, Monochromatic light[ Electromagnetic radiation, especially visible radiation, of only one frequency or wavelength]. It can travel over great distance without spread.   LASER LIGHT :-                                   1. It is very different than normal light and contains only one specific wavelength of light.                                 2. A laser light has very tight beam and is very strong and concentrated.                                 3. A laser light can go to the moon and th...
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ECHO when it happens and Mechanism of Hearing Aid

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What is Echo? 
                 - When a person shouts in a big empty hall, we first hear his original sound, after that we hear the reflected sound of the shout. This reflected sound is known as Echo. An echo is nothing but just the reflected sound. So, the repetition of sound caused by the reflection of the sound waves is called an echo. 

 -The sensation of the sound persists in our brain for about 0.1s, i.e. sound to hear a distinct echo, the time interval between the original sound and the reflected sound must be 0.1s. 

 - The minimum distance between the source of the sound and the obstacle must be 17.2m. This distance will change with the change in temperature. Echoes may be heard more than once due to successive multiple reflections. The rolling of thunder is due to successive reflections of sound from a number of reflecting surfaces, such as clouds and the land. It is used in measuring the depth of sea and altitude of flying aircraft, etc.

Mechanism of Hearing Aid-
This is a device used by people with hearing loss. It is an electronic, battery-operated device. It receives sounds through a microphone which converts the sound waves to electrical signals. These electrical signals are amplified by an amplifier. The amplified electrical signals are given to a speaker of the hearing aid. The speaker converts the amplified electrical signals to sound and then sends to the ear for clear hearing.

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