Short Answer TypeFind the minimum wavelength of the emitted X-rays, when an X-ray tube is operated at 50 kV.
i) Define half-life of a radioactive substance.
ii) Using the equation, N = No e-
t, obtain the relation between half-life (T) and decay constant (
of a radioactive substance.
With the help of a suitable example and an equation, explain the term pair production.
Draw a labelled diagram of a full wave rectifier. Show how output voltage varies with time, if input voltage is a sinusoidal voltage.
Long Answer TypeDerive an expression for intensity of electric field at a point in broadside position or on an equatorial line of an electric dipole.
Figure below shows a capacitor C, an inductor L and resistor R, connected in series to an ac supply of 220 V.
Calculate:
i) the resonant frequency of the given LCR circuit
ii) current flowing through the circuit
iii) Average power consumed by the circuit.
i) Resonant frequency,
ii) Current flowing through the circuit, I = 
iii)Average power consumed by the circuit, <P> = VT I
Power, P = I2 R = (2.2)2 x 100 = 484 W
On the basis of Huygen's wave theory of light, show that the angle of reflection is equal to the angle of incidence. You must draw a labelled diagram for this deviation.
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