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(A) Between any two given energy levels,...

(A) Between any two given energy levels, the number of absorption transitions is always less than or equal to the number of emission transitions.
(R): Absorption transitions start from the lowest energy level only and may end at any higher energy level. But emission transitions may start from any higher energy level and end at any energy level below it.

A

Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'.

B

Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'

C

'A' is true and 'R' is false

D

'A' is false and 'R' is true

Text Solution

Verified by Experts

The correct Answer is:
A
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AAKASH SERIES-ATOMS-EXERCISE -IB
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  2. (A) Hydrogen atom consists of only one electron but its emission spect...

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  3. (A) For the scattering of a.-particles at a large angles. only the nuc...

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  4. (A) Between any two given energy levels, the number of absorption tran...

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  5. (A) Atoms of each element are stable and emit characteristic spectrum ...

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  6. (A) Most of the mass of the atom is concen- trated in its nucleus (R...

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  7. (A) Bohr's third postulate states that the stationary orbits are these...

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  8. (A) The total energy of an electron revolving in any stationary orbit ...

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  9. (A) In tho experiment of alpha particle scattering, extremely thin gol...

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  10. (A) In alpha particle scattering number of alpha particles undergoing ...

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  11. (A) Electrons in the atom are held due to coulomb forces (R) : The a...

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  12. (A) According to electromagnetic theory an accelerated particle contin...

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  13. (A) A laser beam of 0.2W can drill holes through a metal sheet whereas...

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  14. (A) LASER is used to measure distant object as moon. (R) Lasers are ...

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  15. (A) In He-Ne laser, population inversion takes place between energy le...

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  16. (A) Crystalline solids can cause X-rays to diffract. (R) lnteratomic...

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  17. (A) In a metal all the free electrons have same energy. (R) : Electr...

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  18. (A) X-ray astronomy is possible only from satellites orbiting the eart...

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  19. (A) : Bohr's atomic model cannot be used to explain multiple electron ...

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  20. (A) Total energy of electron in an hydrogen atom is negative. (r) :...

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