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When was the first communication satellite 'Telstar' launched?

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Important Questions on Electromagnetic Waves

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Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves
Name the electromagnetic radiations used for (a) water purification, and (b) eye surgery.
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Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves
A donor impurity results in
MEDIUM
Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves
The waves used by artificial satellites for communication purposes are
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Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves
Why are infra-red waves often called heat waves ? Explain.
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Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves
Match List - I with List - II.
List-I List-II
(a) Source of microwave frequency (i) Radioactive decay of nucleus
(b) Source of infrared frequency (ii) Magnetron
(c) Source of Gamma Rays (iii) Inner shell electrons
(d) Source of X-rays (iv) Vibration of atoms and molecules
    (v) LASER
    (vi) RC circuit

Choose the correct answer from the options given below:

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Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves
Which mode of propagation is used by short wave broadcast services ?
EASY
Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves
Due to Doppler's effect the shift in wavelength observed is 0.1 Å for a star producing wavelength 6000 Å. Velocity of recession of the star will be
EASY
Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves
Name the electromagnetic radiations used for eye surgery.
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Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves
The source of electromagnetic wave can be a charge.
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Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves
Long distance short- wave radio broadcasting uses
EASY
Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves
Identify the part of the electromagnetic spectrum used in i radar and ii eye surgery. Write their frequency range.
HARD
Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves
A small angled prism of 4° deviates a ray through 2.48°. Find the refractive Index of the prism. 
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Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves

Write down one use of X-ray.

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Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves
Equation for wave vector is:
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Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves
Out of the following options which one can be used to produce a propagating electromagnetic wave?
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Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves
A thin prism having refracting angle 10o is made of glass of refractive index 1.42. This prism is combined with another thin prism made of glass of refractive index 1.7. This combination produces dispersion without deviation. The refracting angle of second prism should be
EASY
Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves
A ray of light is incident at an angle of incidence i, on one face of a prism of angle A (assumed to be small) and emerges normally from the opposite face. If the refractive index of the prism is μ, the angle of incidence i, is nearly equal to
HARD
Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves
Angle of minimum deviation for a prism of refractive index 1.5 is equal to the angle of the prism. The angle of the prism is givencos⁡41° - 24′- 36′′= 0.75
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Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves
What is a non dispersive medium?
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Physics>Modern Physics>Electromagnetic Waves>Sources of Electromagnetic Waves
For a medium, refractive indices for violet, red and yellow are 1.62, 1.52 and 1.55 respectively. The dispersive power of the medium will be