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Basic concepts of electromagnetic spectrum:
BASIC CONCEPTS
1. When Sun light falls on a prism, the transmitted light produces a sequence of colours called 'Spectrum'.
2. A spectrum is a group of wavelengths or frequencies.
3. Colour is a sensation in the brain due to the execution of retina, by an electromagnetic wave of some particular wavelength.
4. The unit of wavelength is Angstrom. It is denoted by Å.
5. 1Å = 10-10m or 10 cm.-8
6. When white light falls on a prism it gives a Spectrum of 7 colours. The seven colours are Violet, Indigo, Blue, Green, Yellow, Orange and Red.
7. Wave length of Violet colour is 4460Å to 4000Å.
8. The radiations having wavelengths less than 4000Å (Violet) are called Ultra Violet radiations (UV).
Advantages of induction motors 1. Simple design. 2. Low cost compared to other motors of the similar capacity. 3. High overload capacity. 4. Very rugged construction.
Water at 20°C flows through a long, straight pipe. The pressure drop is measured along a section of the pipe of length 1.3 m as a function of average velocity through the pipe. Res
Q. State any three properties of the nuclear forces. (i) A Nuclear force is charge independent. (ii) A Nuclear force is the strongest recognized force in nature. (iii) Nucl
Define the Yttrium Aluminium Garnet doped with Neodymium laser in short. Nd:YAG laser: a. Nd:YAG, this term stands for Yttrium Aluminium Garnet doped along with Neodymium
It is the product of either change in an electric dipole with the distance separating them.
.In order to deposit films of the alloy YBa2Cu3, the metals Y, Ba, and Cu are evaporated from three point sources. The latter are situated at the corners of an equilateral triangle
liquefication of gases
what is the meaning of heat capacity
(i) A matter pulse is not electromagnetic in behavior. (ii) Practical observation of matter waves is possible only when the de-Broglie wavelength is of the order of the size of
A Neutron Star is formed in the aftermath of a Supernova explosion. The star was originally rotating with a period of 20 days and had a mass of 2x10 30 kg and radius of 6x10 8 m.
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