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प्रश्न
Answer briefly.
Does an ordinary electric lamp emit EM waves?
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उत्तर
Yes, an ordinary electric lamp emits EM waves.
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संबंधित प्रश्न
Identify the part of the electromagnetic spectrum which is suitable for radar system used in aircraft navigation.
Name the parts of the electromagnetic spectrum which is
used to treat muscular strain.
Write in brief, how these waves can be produced.
The small ozone layer on top of the stratosphere is crucial for human survival. Why?
Why are infra-red waves often called heat waves? Explain.
What is the range of the wavelength of the following electromagnetic waves?
(a) Infrared.
Give the range of wavelength of the electromagnetic waves visible to us.
What do you understand by the invisible spectrum?
Name the rays or waves of highest frequency .
Name the waves used for taking photographs in dark.
X-ray and visible light travel at the same speed in vacuum. Do they travel at the same speed in glass?
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Name the scientist who discovered Visible light
Arrange the following electromagnetic waves in increasing order of their frequencies (i.e. begin with the lowest frequency):
Visible light, y rays, X rays, microwaves, radio waves, infrared radiations, and ultraviolet radiation.
Define the term "Intensity" in the photon picture of electromagnetic radiation.
State three properties of infrared radiations similar to that of visible light.
Name the radiations used for the detection of fracture in bones.
State two uses of infrared radiations.
Answer briefly.
Why are microwaves used in radar?
Answer briefly.
Why light waves travel in a vacuum whereas sound waves cannot?
Answer briefly.
What are radio waves?
Find the photon energy in units of ev for electromagnetic wave if waves length 40 m. Given h = 6.63 × 10–34 J.
Identify the electromagnetic radiation and write its wavelength range, which is used to kill germs in water purified. Name the two sources of these radiations.
What do electromagnetic waves require for propagation?
How are the electric and magnetic fields oriented in an electromagnetic wave?
In \[c = \nu\lambda\], what do \[c\], \[\nu\], and \[\lambda\] represent?
What can result from excess ultraviolet exposure?
What gives rise to gamma rays?
