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Q. What are uses of ultra-violet radiations?
Uses of ultra-violet radiations:
(i) They are utilized to destroy the bacteria and for sterilizing surgical instruments.
(ii) These radiations are utilized in detection of forged documents, finger prints in forensic laboratories.
(iii) They are utilized to preserve the food items.
(iv) They assist to find the structure of atoms.
The relative permeability of a paramagnetic substance is (A) Unity. (B) Slightly more than unity. (C) Zero. (D) less than unity. Ans: The relativ
a yellow lamp emits light with a wavelength of 6.00E-7 meters. Calculate the frequency of the yellow light.
Explain why easier to pull a lawn roller than to push it? Explaination : In Pulling, effective weight of lawn mover= mg-fsinx In pushing, effective weight = mg+
Describe Kirchoffs Current Law? Ans. It defines " the current flowing toward a point in a circuit have to be equal to the current flowing away from that point. I = I 1 + I
Can you explain lens maker's formula. Derive the mathematical expression for the effective focal length of two thin lenses in contact.
Capacitors in series: When three capacitors are connected in series. If one electron moves from the negative terminal of the cell to the right hand plate of C 3 , and one elec
derive an expression for the variation of g with altitude or depth
There is a point between the Earth and the Moon where the gravitational effects of the two bodies balance each other. Calculate the distance from the center of the Earth to this po
When atoms (or) group of atoms are added, to form more saturated compound it is known as addition reaction.
what is cyclotron
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