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The wavelength of an ultraviolet radiati...

The wavelength of an ultraviolet radiation is `3xx10^(-5)cm`. What is the energy, in eV, of the associated photon? `( c = 3xx10^(10) cm.s^(-1))`

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The correct Answer is:
4.14 eV
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When ultraviolet rays of wavelength 620 Å is incident on a hydrogen atom in the ground state, its electron is emitted with a velocity of 1.5 xx10^(6) m *s^(-1) . What is the ionisation energy of hydrogen ? Given , h= 6.625xx10^(-34)J *s , mass of electron = 9.1 xx 10^(-31)kg, c=3xx 10^(8)m*s^(-1) and 1 eV=1.6xx 10^(-19)J .

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CHHAYA PUBLICATION-QUANTUM THEORY-Exercise (Problem Set- I)
  1. For a monochromatic radiation incident on a metal surface, the stoppin...

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  2. For a monochromatic radiation incident on the metal surface, the photo...

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  3. The wavelength of an ultraviolet radiation is 3xx10^(-5)cm. What is th...

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  4. A photon has an energy of 75eV. Find its frequency and momentum.

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  5. Wavelength of some X-ray is 1Å. Determine the energy of the X-ray phot...

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  6. The photon energy of a radiation is 2.55eV. Determine the frequency an...

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  7. How many photons will a source of power 50W produce per second? The wa...

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  8. A red line in the hydrogen spectrum has a wavelength of 6563 Å. Find o...

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  9. The photon energy of a radiation is 1keV. What will be its (i) frequen...

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  10. The photon energy corresponding to a radiation of wavelength 5000 Å is...

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  11. Work function for monlybdenum is 4.2 eV. Determine the threshold wavel...

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  12. Work function for a metal is 1.77 eV and the wavelength of an incident...

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  13. Energy of incident photon on a metal surface is 5.0 eV and photoelectr...

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  14. thresold Wavelength of incident light on a metal surface is 404 Å. Det...

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  15. Stopping poential for the electrons emitted due to incidence of light ...

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  16. For photoelectric emission, threshold wavelength of a metal is 2460 Å....

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  17. The stopping potential of copper is 2.72V for light of wavelength 1849...

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  18. When radiation of wavelength lamda is incidenton a metallic surface, t...

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  19. work function for electronic emission from sodium is 1.77 eV. What is ...

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  20. The work function for electron emission from a metal is 1.9 eV, and t...

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