Alpha Question Bank for Medical: Chemistry>Chapter 2 - Structure of Atom>Exercise 2>Q 10

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How many photons of light having a wavelength of $5000 Å$ are necessary to provide $1$ joule of energy?

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Important Questions on Structure of Atom

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Alpha Question Bank for Medical: Chemistry>Chapter 2 - Structure of Atom>Exercise 2>Q 11

A light source of wavelength

λ

illuminates a metal and ejects photo-electrons with

(K . E .)_{\max} = 1 eV

Another light-source of wavelength

\frac{λ}{3}

, ejects photoelectrons from same metal with

(K . E .)_{\max} = 4 eV

. Find the value of work function.

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Alpha Question Bank for Medical: Chemistry>Chapter 2 - Structure of Atom>Exercise 2>Q 12

A photon of

300 nm

is absorbed by a gas and then emits two photons. If one photon has a wavelength

400 nm

, then the wavelength of second photon in

nm

is

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Alpha Question Bank for Medical: Chemistry>Chapter 2 - Structure of Atom>Exercise 2>Q 13

The ratio of radius of two different orbits in a

H

-atom is

4 : 9

. Then, the ratio of the frequency of revolution of electron in these orbits is

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Alpha Question Bank for Medical: Chemistry>Chapter 2 - Structure of Atom>Exercise 2>Q 14

The ratio of the time period of electrons in second Bohr orbit of

{He}^{+}

and fourth Bohr orbit of

{Li}^{2 +}

is

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Alpha Question Bank for Medical: Chemistry>Chapter 2 - Structure of Atom>Exercise 2>Q 15

If the ionisation potential of a hydrogen like species is

20 V,

its first excitation potential will be

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Alpha Question Bank for Medical: Chemistry>Chapter 2 - Structure of Atom>Exercise 2>Q 16

The amount of energy required to excite the electron from third to fourth Bohr's orbit in

B^{4 +}

will be

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Alpha Question Bank for Medical: Chemistry>Chapter 2 - Structure of Atom>Exercise 2>Q 17

A single electron orbits a stationary nucleus of charge

+ Ze,

where

Z

is a constant. It requires

47.2 eV

to excite an electron from the second Bohr's orbit to third Bohr's orbit, find the value of

Z

.

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Alpha Question Bank for Medical: Chemistry>Chapter 2 - Structure of Atom>Exercise 2>Q 18

The ionization energy of

{He}^{+}

is

19.6 \times 10^{- 18} J {atom}^{- 1}

. The energy of the first stationary state of

{Li}^{+ 2}

will be