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प्रश्न
Name the scientist who discovered Ultraviolet rays
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उत्तर
Ritter
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संबंधित प्रश्न
Name the parts of the electromagnetic spectrum which is
used as a diagnostic tool in medicine.
Write in brief, how these waves can be produced.
Give the range of wavelength of the electromagnetic waves visible to us.
Name three properties of ultraviolet radiations which are similar to visible light.
Which part of electromagnetic spectrum is used in radar systems?
When a Coolidge tube is operated for some time it becomes hot. Where does the heat come from?
Is it possible that in a Coolidge tube characteristic Lα X-rays are emitted but not Kα X-rays?
The short-wavelength limit shifts by 26 pm when the operating voltage in an X-ray tube is increased to 1.5 times the original value. What was the original value of the operating voltage?
(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 e.m. waves which are suitable for radar systems used in aircraft navigation. Write the range of frequency of these waves.
What happens to the intensity of light from a bulb if the distance from the bulb is doubled? As a laser beam travels across the length of a room, its intensity essentially remains constant. What geometrical characteristic of LASER beam is responsible for the constant intensity which is missing in the case of light from the bulb?
