Please select a subject first
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Answer briefly.
Explain the necessity of a carrier wave in communication.
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Solve the numerical problem.
A transmitting antenna at the top of a tower has a height of 32 m and that of the receiving antenna is 50 m. What is the maximum distance between them for satisfactory communication in line of sight mode? The given radius of Earth is 6.4 × 106 m.
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What is a conical pendulum?
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Answer the following question.
Show that its time period is given by, 2π`sqrt((l cos theta)/("g"))` where l is the length of the string, θ is the angle that the string makes with the vertical, and g is the acceleration due to gravity.
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Define angular velocity.
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Answer the following question.
Show that the centripetal force on a particle undergoing uniform circular motion is -mrω2.
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Solve the following problem.
A car moves in a circle at a constant speed of 50 m/s and completes one revolution in 40 s. Determine the magnitude of the acceleration of the car.
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Solve the following problem.
A particle moves in a circle with a constant speed of 15 m/s. The radius of the circle is 2 m. Determine the centripetal acceleration of the particle.
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Solve the following problem.
A projectile is thrown at an angle of 30° to the horizontal. What should be the range of initial velocity (u) so that its range will be between 40m and 50 m? Assume g = 10 m s-2.
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Answer the following question.
Explain spherical aberration for spherical mirrors. How can it be minimized? Can it be eliminated by some curved mirrors?
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Explain chromatic aberration for spherical lenses.
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Answer the following question in detail.
What is achromatism? Derive a condition to achieve achromatism for a lens combination. State the conditions for it to be converging.
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Answer the following question in detail.
Describe spherical aberration for spherical lenses. What are the different ways to minimize or eliminate it?
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Answer the following question in detail.
Derive the expressions for the magnifying power and the length of a compound microscope using two convex lenses.
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Refractive index of a flint glass varies from 1.60 to 1.66 for visible range. Radii of curvature of a thin convex lens are 10 cm and 15 cm. Calculate the chromatic aberration between extreme colours.
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The electric field in a region is given by `vec"E"` = 5 `hatk`N/C. Calculate the electric flux Through a square of side 10.0 cm in the following cases
- The square is along the XY plane
- The square is along XZ plane
- The normal to the square makes an angle of 45° with the Z axis.
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Choose the correct option.
The binding energy of a satellite revolving around the planet in a circular orbit is 3 × 109 J. It's kinetic energy is ______.
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Answer the following question.
Define the binding energy of a satellite.
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Answer the following question.
What do you mean by geostationary satellite?
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Answer the following question.
What is periodic time of a geostationary satellite?
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