At what atomic number would a transition from n = 2 to n = 1 energy level result in emission of photon of λ = 3 × 10 - 8 m .

According to Rydberg's formula, 1 λ = RZ 2 1 n 1 2 - 1 n 2 2 Substituting the values of known quantities, 1 3 × 10 - 8 = 1 . 097 × 10 7 × Z 2 1 1 2 - 1 2 2 Z 2 = 4 3 × 10 - 8 × 1 . 097 × 10 7 × 3 Z 2 = 4 Z = 2 Hence, the given transition will result from helium atom which has atomic number 2 .

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Calculate the two longest wavelengths of the radiation emitted when hydrogen atoms make transitions from higher states to $n = 2$ state.

Important Questions on Structure of Atom

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 22

What electron transition in the

{He}^{+}

spectrum would have the same wavelength as the first Lyman transition of hydrogen?

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 23

Calculate the frequency of light emitted for an electron transition from the sixth to second orbit of the hydrogen atom. In what region of the spectrum does this light occur?

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 24

At what atomic number would a transition from

n = 2

n = 1

energy level result in emission of photon of

λ = 3 \times 10^{- 8} m .

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 25

In a container a mixture is prepared by mixing of three samples of hydrogen, helium ion

({He}^{+})

and lithium ion

({Li}^{2 +}) .

In sample all the hydrogen atoms are in

1^{st}

excited state and all the

{He}^{+}

ions are in third excited state and all the

{Li}^{2 +}

ions are in fifth excited state. Find the total number of spectral fines observed in the emission spectrum of such a sample, when the electrons return back up to the ground state.

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 26

An electron in a

H

-atom in its ground state absorbs

1.5

times as much energy as the minimum required for its escape

(13.6 eV)

from the atom. What is wavelength of the emitted electron?

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 27

Deduce the condition when the de-Broglie wavelength associated with an electron would be equal to that associated with a proton, if a proton is

1836

times heavier than an electron.

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 28

An electron, which is practically at rest, is initially accelerated through a potential difference of

100

volts. It then has a de Broglie wavelength

= λ_{1} Å .

It then gets retarded through

19

volts and then has a wavelength

λ_{2} Å .

Further retardation through

32

volts changes the wavelength to

λ_{3} Å .

What is

\frac{λ_{3} - λ_{2}}{λ_{1}} ?

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 29

If an electron having kinetic energy

2 eV

is accelerated through the potential difference of

2

Volt. Then calculate the wavelength associated with the electron.

Calculate the two longest wavelengths of the radiation emitted when hydrogen atoms make transitions from higher states to n=2 state.

Important Questions on Structure of Atom

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Calculate the two longest wavelengths of the radiation emitted when hydrogen atoms make transitions from higher states to $n = 2$ state.