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Choose the correct option.
The waves used by artificial satellites for communication purposes are
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Answer briefly.
Name the three basic units of any communication system.
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Answer briefly.
What is meant by noise?
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Answer briefly.
What is meant by bandwidth?
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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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Answer the following question.
Are freezing point and melting point same with respect to change of state? Comment.
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Define Sublimation.
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Define Triple point.
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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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