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प्रश्न
Answer briefly.
What are radio waves?
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उत्तर
- Radio waves are produced by accelerated motion of charges in a conducting wire. The frequency of waves produced by the circuit depends upon the magnitudes of the inductance and the capacitance.
- Thus, by choosing suitable values of the inductance and the capacitance, radio waves of the desired frequency can be produced.
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संबंधित प्रश्न
A radio can tune in to any station in the 7.5 MHz to 12 MHz band. What is the corresponding wavelength band?
Name the high energetic invisible electromagnetic waves which help in the study of the structure of crystals
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- Name the wave.
- State its speed in vacuum.
- State its one use.
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(a) Infrared.
Give the range of wavelength of the electromagnetic waves visible to us.
Name the rays or waves of highest frequency .
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- Name the two waves.
- Compare the speeds of these waves when they travel in vacuum.
Can X-rays be polarised?
Consider a photon of a continuous X-ray coming from a Coolidge tube. Its energy comes from
Mark the correct options.
(a) An atom with a vacancy has smaller energy that a neutral atom.
(b) K X-ray is emitted when a hole makes a jump from the K shell to some other shell.
(c) The wavelength of K X-ray is smaller than the wavelength of L X-ray of the same material.
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(a) Infrared rays
(b) Ultraviolet rays
(c) γ -rays
Write one use of each of the above.
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Choose the correct option.
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- λ2 is used to kill germs in water purifies.
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- Write one more application of each.
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- is used for studying crystal structure.
Write any one method of the production of each of the above radiations.
Name the electromagnetic radiation that has been used in obtaining the image below.
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In \[c = \nu\lambda\], what do \[c\], \[\nu\], and \[\lambda\] represent?
How do ultraviolet rays compare with visible light?
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