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In the diffraction pattern due to a single slit of width 'd' with incident light of wavelength 'λ', at an angle of diffraction θ. the condition for first minimum is ....
(a)`lambda sin theta =d`
(b) `d costheta =lambda`
(c)`d sintheta=lambda`
(d) `lambda cos theta=d`
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Draw a neat labelled diagram of a parallel plate capacitor completely filled with dielectric.
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A point is situated at 7cm and 7·2 cm from two coherent sources. Find the· nature of illumination at the point if wavelength of light is 4000A.
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Obtain the expression for current sensitivity of moving coil galvanometer.
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A circular coil of 250 turns and diameter 18 cm carries a current of 12A. What is the magnitude of magnetic moment associated with the coil?
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State an expression for K. E. (kinetic energy) and P. E. (potential energy) at displacement ‘x’ for a particle performing linear S.H. M. Represent them graphically. Find the displacement at which K. E. is equal to P. E.
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Let n1 and n2 be the two slightly different frequencies of two sound waves. The time interval between waxing and immediate next waning is ______.
(A) `1/(n_1-n_2)`
(B) `2/(n_1-n_2)`
(C) `(n_1-n_2)/2`
(D) `1/(2(n_1-n_2))`
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For a glass plate as a polariser with refractive index 1.633, calculate the angle of incidence at which light is polarised.
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Draw a neat labelled diagram for Davisson and Germer experiment, for diffraction of electron wave.
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If the critical angle of a medium is sin-1(3/5), find the polarising angle.
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An ideal voltmeter has _______.
(A) low resistance
(b) high resistance
(C) infinite resistance
(D) zero resistance
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Describe, with the help of a circuit diagram, the working of Zener diode as a voltage regulator.
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Stretching of a rubber band results in _______.
(A) no change in potential energy.
(B) zero value of potential energy.
(C) increase in potential energy.
(D) decrease in potential energy.
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A body cools at the rate of 0.5°C / minute when it is 25° C above the surroundings. Calculate the rate of cooling when it is 15°C above the same surroundings.
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Prove the law of conservation of energy for a particle performing simple harmonic motion.Hence graphically show the variation of kinetic energy and potential energy w. r. t. instantaneous displacement.
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Explain how moving coil galvanometer is converted into a voltmeter. Derive the necessary formula.
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A rectangular coil of a moving coil galvanometer contains 100 turns, each having area
15 cm2. It is suspended in the radial magnetic field 0.03 T. The twist constant of suspension
fibre is 15 x 10-10 N-m/degree. Calculate the sensitivity of the moving coil galvanometer.
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Within the elastic limit, find the work done by a stretching force on a wire.
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A set of 12 tuning forks is arranged in order of increasing frequencies. Each fork produces Y beats per second with the previous one. The last is an octave of the first. The fifth fork
has a frequency of 90 Hz. Find Y and frequency of the first and the last tuning forks.
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If the Earth completely loses its gravity, then for any body _______.
(A) both mass and weight become zero.
(B) neither mass nor weight become zero.
(C) weight becomes zero but not the mass.
(D) mass becomes zero but not the weight.
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