Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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The Electron Beam in a Colour Tv is Accelerated Through 32 Kv and Then Strikes the Screen. What is the Wavelength of the Most Energetic X-ray Photon? - Physics

ConceptElectromagnetic Spectrum

Question

The electron beam in a colour TV is accelerated through 32 kV and then strikes the screen. What is the wavelength of the most energetic X-ray photon?

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

Solution

Given:-

Potential of the electron beam, V = 32 kV = 32 × 103 V

"Energy", E = 32 xx 10^3  "eV"

Wavelength of the X-ray photon (lambda) is given by

lambda = (hc)/E

Here,
h = Planck's constant
c = Speed of light

therefore lambda = (hc)/E

⇒ lambda = (1242  "eVnm")/(32 xx 10^3)

⇒ lambda = 38.8 xx 10^-3  "nm"

⇒ lambda = 38.8  "pm"

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Solution The Electron Beam in a Colour Tv is Accelerated Through 32 Kv and Then Strikes the Screen. What is the Wavelength of the Most Energetic X-ray Photon? Concept: Electromagnetic Spectrum.
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