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प्रश्न
Name the scientist who discovered Microwaves
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उत्तर
Hertz
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संबंधित प्रश्न
What is the range of the wavelength of the following electromagnetic waves?
(a) Infrared.
Name the rays or waves of highest frequency .
In a Coolidge tube, electrons strike the target and stop inside it. Does the target get more and more negatively charged as time passes?
The wavelength of Kα X-ray of tungsten is 21.3 pm. It takes 11.3 keV to knock out an electron from the L shell of a tungsten atom. What should be the minimum accelerating voltage across an X-ray tube having tungsten target which allows production of Kα X-ray?
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Continuous X-rays are made to strike a tissue paper soaked with polluted water. The incoming X-rays excite the atoms of the sample by knocking out the electrons from the inner shells. Characteristic X-rays are analysed and the intensity is plotted against the wavelength. Assuming that only Kα intensities are detected, list the elements present in the sample from the plot. Use Moseley's equation v − (25 × 1014Hz)(Z − 1)2.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Name the scientist who discovered
X-rays
Name the scientist who discovered Visible light
Answer briefly.
Can we produce a pure electric or magnetic wave in space? Why?
Write two uses of the following radiation.
Gamma rays
Identify the electromagnetic wave whose wavelength range is from about 10-3 m to about 10-1 m. Write one use of this.
