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In a Coolidge Tube, Electrons Strike the Target and Stop Inside It. Does the Target Get More and More Negatively Charged as Time Passes? - Physics

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प्रश्न

In a Coolidge tube, electrons strike the target and stop inside it. Does the target get more and more negatively charged as time passes?

टीपा लिहा

उत्तर

An electron emitted from the filament undergoes a number of collisions inside the material and loses its kinetic energy before coming to rest. This energy is utilised to give out photons or  eject electrons from the atoms of the target. These electrons move to the battery connected to the circuit. Thus, the target does not get more and more negatively charged as time passes.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 22: X-rays - Short Answers [पृष्ठ ३९३]

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एचसी वर्मा Concepts of Physics Vol. 2 [English] Class 11 and 12
पाठ 22 X-rays
Short Answers | Q 2 | पृष्ठ ३९३

संबंधित प्रश्‍न

Arrange the following radiations in the order of their increasing wavelength:

X-rays, infrared rays, ratio waves, gamma ray and microwaves.


Which radiation is used for satellite communication?


State the approximate range of wavelength associated with the ultraviolet rays.


State the approximate range of wavelength associated with infrared rays.


Name the radiations of wavelength just shorter than 4 × 10-7 m.


Give one use of ultraviolet radiation.


X-ray and visible light travel at the same speed in vacuum. Do they travel at the same speed in glass?


The X-ray coming from a Coolidge tube has a cutoff wavelength of 80 pm. Find the kinetic energy of the electrons hitting the target.

(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)


The Kβ X-ray of argon has a wavelength of 0.36 nm. The minimum energy needed to ionize an argon atom is 16 eV. Find the energy needed to knock out an electron from the K shell of an argon atom.


The electric current in an X-ray tube (from the target to the filament) operating at 40 kV is 10 mA. Assume that on an average, 1% of the total kinetic energy of the electron hitting hte target are converted into X-rays.
(a) What is the total power emitted as X-rays and (b) how much heat is produced in the target every second?


The wavelengths of Kα and Lα X-rays of a material are 21.3 pm and 141 pm respectively. Find the wavelength of Kβ X-ray of the material.

(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)


Write the range of the wavelength of the following electromagnetic radiations:
(a) Infrared rays
(b) Ultraviolet rays
(c) γ -rays

Write one use of each of the above.


Name the scientist who discovered
 X-rays


Name three radiations and their wavelength range which are invisible and beyond the violet end of the visible spectrum.


An e.m. wave exerts pressure on the surface on which it is incident. Justify.


X-rays, gamma rays and microwaves travelling in a vacuum have ______.


The ozone layer absorbs


Following QN ∴ 14, the radiation force on the roof will be


Electromagnetic waves with wavelength

  1. λ1 is suitable for radar systems used in aircraft navigation.
  2. λ2 is used to kill germs in water purifiers.
  3. λ3 is used to improve visibility in runways during fog and mist conditions.

Identify and name the part of the electromagnetic spectrum to which these radiations belong. Also arrange these wavelengths in ascending order of their magnitude.


Below is an incomplete table showing the arrangement of electromagnetic spectrum in the increasing order of their wavelength. Complete the table:

Gamma ray X - ray UV rays Visible rays Infrared A Radio waves
  1. Identify the radiation A.
  2. Name the radiation used to detect fracture in bones.
  3. Name one property common to both A and Radio waves.

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