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Q. What is fluorescence?
When an atomic or else molecular system is excited into higher energy state by absorption of energy it returns back to lower energy state in a time less than 10-5 second and the system is found to glow brightly by emitting radiation of longer wavelength. While ultra violet light is incident on certain substances they emit visible light. This phenomenon is entitled as fluorescence.
the velocity of a particle moving along x axis is defined by v=kx^3-4x^2+6x where v is in m/s,x in m and k is a constant .if k=2 compute the acceleration when x=2m
With the help of a bb diagram, define the principle of an optical communication system. Give its two advantages over cable communication system
What is a capacitor
Using a wheel and axle Use the pencil sharpener that you used in experiment A 8. Pull on the end of the string that held the books and observe how rapidly the crank turns.
Can you give the S.I unit of electric displacement vector?
Positive rays are sometimes called as the canal waves. These were found by Goldstein. If the cathode of a discharged tube has holes in it and the pressure of the gas is around 10-3
what is turning force and moment force ?
What is a starry sky? Probably one of the most beautiful lighting effects which can be created that can be very simple or rather sophisticated. In its simplest form, a starry s
How is a wave front dissimilar from a ray ? Draw the geometrical, shape of the wave fronts when (i) light diverges from a point source, and (ii) light emerges out of a convex le
what is the unit of torque
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