Department of Pre-University Education, Karnataka course PUC Karnataka Science Class 12
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# Find the Cutoff Wavelength for the Continuous X-rays Coming from an X-ray Tube Operating at 30 Kv. - Physics

ConceptElectromagnetic Spectrum

#### Question

Find the cutoff wavelength for the continuous X-rays coming from an X-ray tube operating at 30 kV.

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

#### Solution

Given:
Voltage of the X-ray tube, V = 30 kV
Cutoff wavelength for continuous X-rays (λ) is given by

λ = (hc)/(eV)

Here ,

h = Planck's constant

V = Voltage of the X-ray tube

c = Speed of light

therefore lambda = (1242  "eV"-"nm")/(e xx 30 xx 10^3)

⇒ lambda = 414 xx 10^-4  "nm" = 41.4  "pm"

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Solution Find the Cutoff Wavelength for the Continuous X-rays Coming from an X-ray Tube Operating at 30 Kv. Concept: Electromagnetic Spectrum.
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