17.(i) What is dispersion of light?
(ii) How is this process responsible for the formation of rainbow.
18.(i) What is an Electro magnet?
(ii) Give three uses of Electromagnet.
Answers
Answer:
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Explanation:
What is dispersion of light?
When white light is passed through a glass prism it splits into its spectrum of colours (in order violet, indigo, blue, green, yellow, orange and red) and this process of white light splitting into its constituent colours is termed as dispersion.
How is this process responsible for the formation of rainbow.
A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured circular arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.
What is an Electro magnet?
An electromagnet is a magnet that runs on electricity. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. The poles of an electromagnet can even be reversed by reversing the flow of electricity.
Give three uses of Electromagnet.
Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment.
17 1 splitting of light into its constituent seven colours is called as dispersion of light.
2 Rainbows are produced by a combination of refraction and reflection and involve the dispersion of sunlight into a continuous distribution of colors.
18 1 An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the center of the coil.
2 Motors and generators.
Transformers.
Relays.
Electric bells and buzzers.
Loudspeakers and headphones.
Actuators such as valves.
Magnetic recording and data storage equipment: tape recorders, VCRs, hard disks.
MRI machines.
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