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If a source of power 4 kW produces 10^(2...

If a source of power 4 kW produces `10^(20)` photons/second, the radiation belong to a part of the specturm called

A

X-rays have wavelength of the order of the inter-atomic spacing

B

ultraviolet rays

C

microwaves

D

`gamma`-rays

Text Solution

Verified by Experts

The correct Answer is:
B
Energy of each photon `(4000)/(10^(20))=4xx10^(17)`
`lambda=(12400xx1.6xx10^(-19))/(4xx10^(-17))A^(0)=49.6+B240Å`
It is in ultraviolet spectrum.
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RESONANCE ENGLISH-ATOMIC PHYSICS-Exercise -3 part -I JEE (Advanced)
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  4. Energy required for the electron excitation in Li^(++) from the first ...

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  5. This question has statement - 1 and statement - 2 of the four choice g...

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  6. After absobing a slowly moving neutron of mass m(N) (mometum ~0), a nu...

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  7. Hydrogen atom is excited from ground state to another state with prin...

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  8. A diatomic molecule is made of two masses m(1) and m(2) which are sepa...

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  9. The anode voltage of a photocell is kept fixed. The wavelength lamda o...

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  10. In a hydrogen like atom electron makes transition from an energy level...

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  11. Hydrogen (.(1)H^(1)), Deuterium (.(1)H^(2)), singly ionised Helium (...

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  12. As an electron makes a transition from an excited state to the ground ...

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  13. Ultraviolet light is incident on two photosensitive materials having w...

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  14. Mention the significance of Davisson-Germer experiment. An alpha-parti...

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  15. De Broglie wavelength associated with an electron acclerated through a...

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  16. A hydrogen atom initially in the ground level absorbs a photon, which ...

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  17. Plot a graph showing the variation of stopping potential with the freq...

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  18. Draw a schematic diagram of the experiment used by. Davisson and Germe...

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  19. The two lines A and B in fig. shows the plot of de- Broglie wavelength...

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  20. Fig. shows the variation of stopping potential V0 with the frequency v...

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