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A parallel beam of uniform,monochromatic...

A parallel beam of uniform,monochromatic light of wavelenth 2640 A has an intensity of `200 W//m^(2)`. The number of photons in `1 m m^(3)` of this radiation are `"................."`

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MOTION-MODERN PHYSICS -1-EXERCISE-3( LEVEL-I)
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  5. 663 mW of light from a 540 nm source is incident on the surface of a ...

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  7. An electron and a photon have the same de Broglie wavelength. Which on...

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  8. An electron microscope uses electrons accelerated by a voltage of 50kV...

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  9. An electron of mass m and charge e initially at rest gets accelerated ...

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  10. Assume that a particle cannot be confined to a sphereical volume of di...

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  11. A hydrogen atom in a state of binding energy 0.85 eV makes a transitio...

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  12. A hydrogen atom is in 5^("in") excited state. When the electron jumps ...

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  13. Find the ratio of series limit wavelength of Balmer series to waveleng...

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  14. Imagine an atom made of a proton and a hypothetical particle of double...

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  15. In a hydrogen atom , the electron moves in an orbit of radius 0.5 A ...

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  16. Explain why nearly all H atoms are in the ground state at room tempera...

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  17. Consider a hydrogen-like atom whose energy in nth excited state is giv...

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  18. A gas of identical hydrogen-like atoms has some atoms in the lowest in...

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  19. A photon collides with a stationary hydrogen atom in ground state inel...

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  20. An H atom in ground state is moving with initial kinetic energy K .It ...

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