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प्रश्न
Name the scientist who discovered Visible light
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उत्तर
Newton
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संबंधित प्रश्न
Name the parts of the electromagnetic spectrum which is
used to treat muscular strain.
Write in brief, how these waves can be produced.
What is the range of the wavelength of the following electromagnetic waves?
(a)X-rays,
Two waves A and B have wavelength 0.01 Å and 9000 Å respectively.
- Name the two waves.
- Compare the speeds of these waves when they travel in vacuum.
The wavelength of X-rays is 0.01 Å. Calculate its frequency. State the assumption made, if any.
Can X-rays be polarised?
The energy of a photon of a characteristic X-ray from a Coolidge tube comes from
The stopping potential in a photoelectric experiment is linearly related to the inverse of the wavelength (1/λ) of the light falling on the cathode. The potential difference applied across an X-ray tube is linearly related to the inverse of the cutoff wavelength (1/λ) of the X-ray emitted. Show that the slopes of the lines in the two cases are equal and find its value.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Give one use of electromagnetic radiations in Infrared radiation.
Answer briefly.
Why are microwaves used in radar?
Answer briefly.
Give two uses of ultraviolet rays.
