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Types of emission and absorption spectra: Emission spectra is a bright spectrum on dark background. It is of three types. They are: 1. ... -
Solar energy: The energy emitted by the sun in the form of heat and light (i.e. radiation) is known as solar energy. The sun is the ultim... -
Ultrasonic waves: the waves of frequency greater than 20,000Hz are known as ultrasonic waves or ultrasound. Bats can produce ultrasonic wave... -
TRANSISTOR: The transistor is a three terminal electronic device formed by the combination of two PN junctions in a specific manner. I... -
HEALTH HAZARDS AND SAFETY PRECAUTIONS: Radioactive substances emit continuously powerful radiations such as β particles, ϒ particles and ... -
Nuclear energy: The energy released during a nuclear reaction is called nuclear energy. Nuclear energy can obtained by two types of nucle... -
A bar magnet strongly attracts an iron piece, but other materials are weakly attracted and some are actually repelled. We may use this resp...
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