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1000 calories of radiant heat are incident on a body. If the body absorbs 400 calories of heat, find the coefficient of emission of the body.
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The second law of thermodynamics deals with the transfer of ______.
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Describe Young’s double-slit experiment with a neat diagram showing points of maximum and minimum intensity.
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In which of the following devices, the eddy current is not used ______
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Why and where are eddy currents are undesirable? How are they minimized?
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A charged 10 microfarad capacitor is connected to an 81 mH inductor. What is the angular frequency of free oscillations of the circuit?
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A charged 10 microfarad capacitor is connected to an 81 mH inductor. What is the angular frequency of free oscillations of the circuit?
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A radio can tune over the frequency range of a portion of the MW broadcast band (800kHz -1200kHz). If its LC circuit has an effective inductance of 200mH, what must be the range of its variable condenser?
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A radio can tune over the frequency range of a portion of the MW broadcast band (800kHz -1200kHz). If its LC circuit has an effective inductance of 200mH, what must be the range of its variable condenser?
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What are eddy currents?
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The kinetic energy and angular momentum of a body rotating with constant angular velocity are E and L. What does `(2E)/L` represent?
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Which of the following would permit finer detail to be examined using a microscope of a given numerical aperture?
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Determine the limit of resolution of a telescope for the light of wavelength 500 nm if the telescope objective has diameter of 5.08 m.
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An alternating emf is applied to a series combination of an inductor and a resistor (R = 100 Ω ). If the impedance of the circuit is `100 sqrt2 Ω`, what is the phase difference between the emf and the current?
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Define the resolving power of a telescope.
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State the formula for resolving the power of a telescope.
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What are the advantages of using a large objective lens in an astronomical telescope?
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The angular displacement of a particle in 6 sec on a circle with angular velocity `pi/3` rad/sec is ______.
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When a sphere rolls without slipping, the ratio of its kinetic energy of translation to its total kinetic energy is ______.
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What is absolute zero temperature?
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