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Atomicity

Which one of ...

Question

Which one of the following statements about the line emission spectrum for atomic hydrogen is incorrect?

A

Electromagnetic radiation is emitted when the electron jumps back to a lower energy level.

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B

Electromagnetic radiation is emitted when the electron is promoted to a higher energy level.

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C

In the visible region of the spectrum the electron returns to the n = 2 energy level.

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D

The electron can only move between fixed energy levels.

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Solution

The correct option is B
Electromagnetic radiation is emitted when the electron is promoted to a higher energy level.

Only when electrons jump back to lower energy level from higher energy levels electromagnetic radiations are radiated.

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Similar questions

Q. Calculate the wavelength of the radiations emitted when an electron in a hydrogen atom undergoes a transition from

4^{t h}

energy level to the

2^{n d}

energy level. In which part of the electromagnetic spectrum does this line lie?

Q. The wavelength of radiation emitted due to transition of electron from energy level E to zero is equal to

λ

. The wavelength of radiation

λ_{1}

emitted when electron jumps from energy level

\frac{3 E}{2}

to zero will be.

Q. The only electron in the hydrogen atom resides under ordinary conditions on the first orbit. When energy is supplied, the electron moves to higher energy orbit depending on the amount of energy absorbed. When this electron returns to any of the lower orbits, it emits energy. Lyman series is formed when the electron returns the lowest orbit while Balmer series is formed when the electron returns to the second orbit. Similarly, Paschen, Brackett, and Pfind series are formed when electron returns to the third, fourth, and fifth from higher orbits, respectively.
Maximum number of lines produced when an electron jumps from nth level to ground level is equal to

\frac{n (n - 1)}{2}

.
If the electron comes back from the energy level having energy E

_{2}

to the energy level having energy E

_{1}

, then difference may be expressed in terms of energy of photon as
E

_{2}

_{1}

Δ

λ

Δ

E
Since h and c are constant,

Δ

E corresponds to definite energy, thus, each transition from one energy level to another will produce a light of definite wavelength. This is actually observed as a line in the spectrum of hydrogen atom.
Wave number of line is given by the formula
v =

R Z^{2} (\frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}})

where R is a Rydberg constant.The wave number of electromagnetic radiation emitted during the transition of electron in between the two levels of Li

^{2 +}

ion whose principal quantum numbers sum is 4 and difference is 2 is :

Q. Hydrogen atom emits blue light when an electron in it jumps from

n = 4

energy level to

n = 2

energy level. Which colour of light would the atom emit when an electron in it jumps from

n = 5

n = 2

Q. Calculate the wavelength of radiation emitted when an electron in a hydrogen atom makes a transition from an energy level with n= 3 to a level with n= 2:

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