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Question

The voltage applied across an X-rays tube is nearly equal to


  1. 10 V

  2. 100 V

  3. 1000 V

  4. 10,000 V

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Solution

The correct option is D

10,000 V


The explanation for the correct answer:-

Option (D)

Step 1: Given data

The voltage applied across an X-rays tube is nearly equal to

V=hceλ

In other words, the energy of a photon is directly proportional to its frequency and inversely proportional to its wavelength.

where,

h= Planck's constant = 6.626x10-34J·s

c = speed of light = 3x108m/sec

e = charge on electron = 1.6×10-19

λ = wavelength

Step 2: Calculating the voltage applied across an X-ray tube,

=(6.6x10-34x3x108)(1.6x10-19x10-10)

10,000V

Hence, option (D) is the correct answer.


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