EASY

Earn 100

What was the mathematical equation given by Max Planck?

Important Questions on Structure of Atom

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

The energy of one mole of photons of radiation of frequency

2 \times 10^{12} Hz

{Jmol}^{- 1}

is _____ J .
(Nearest integer)
(Given:

h = 6.626 \times 10^{- 34} Js

N_{A} = 6.022 \times 10^{23} {mol}^{- 1}

)

EASY

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

The value of Planck's constant in electron volts

(eV)

is _______

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

The energy of one mole of photons of radiation of wavelength

300 nm

is (Given :

h = 6.63 \times 10^{- 34} J s, N_{A} = 6.02 \times 10^{23} {mol}^{- 1} c = 3 \times 10^{8} m s^{- 1}

)

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

Which of the graphs shown below does not represent the relationship between incident light and the electron ejected from metal surface?

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

{[Ti {(H_{2} O)}_{6}]}^{3 +}

absorbs light of wavelength

498 nm

during a

d - d

transition. The octahedral splitting energy for the above complex is _______

\times 10^{- 19} J

. (Round off to the Nearest Integer).

h = 6.626 \times 10^{- 34} Js; c = 3 \times 10^{8} {ms}^{- 1}

EASY

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

Given the value of Rydberg constant is

10^{7} m^{- 1}

, the wave number of the last line of the Balmer series in hydrogen spectrum will be:

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

The number of photons emitted by a monochromatic (single frequency) infrared range finder of power

1 mW

and wavelength of

1000 nm

, in

0.1

second is

x \times 10^{13}

. The value of

x

is (Nearest integer)

(h = 6.63 \times 10^{- 34} Js, c = 3.00 \times 10^{8} {ms}^{- 1})

EASY

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

The frequency for a series limit of Balmer and Paschen series respectively are

f_{1}

and

f_{3}

. If the frequency of the first line of Balmer series is

f_{2}

then the relation between

f_{1}, f_{2}

and

f_{3}

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

Let the energy of an

n^{th}

orbit of

H

atom be

- 21.76 \times 10^{- 19} / n^{2} J

. What will be the longest wavelength of energy required to remove an electron from the third orbit of

{He}^{+}

ion?

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

A $50$ watt bulb emits monochromatic red light of wavelength of $795 nm$ . The number of photons emitted per second by the bulb is $x \times 10^{20} .$ The value of $x$ is _____ .

(Nearest integer)

$[Given : h = 6.63 \times 10^{- 34} Js and c = 3.0 \times 10^{8} {ms}^{- 1}]$

EASY

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

A photoelectric surface is illuminated successively by monochromatic light of wavelength

λ

and

\frac{λ}{2}

. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material is:
(

h

= Planck's constant,

c

= speed of light)

EASY

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

The wavelengths of two photons are

2000 Å

and

4000 Å

, respectively. What is the ratio of their energies?

EASY

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

The magnitude of acceleration of the electron in the $n^{th}$ orbit of hydrogen atom is $a_{H}$ and that of singly ionised helium atom is $a_{He}$ . The ratio $a_{H} : a_{He}$ is,

EASY

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

The energies

E_{1}

and

E_{2}

of two radiations are

25 eV

and

50 eV

, respectively. The relation between their wavelengths i.e.,

λ_{1}

and

λ_{2}

will be

EASY

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

In Balmer series for hydrogen atom, find the energy of photon corresponding to longest wavelength.

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

According to Bohr's theory, the time averaged magnetic field at the centre (i.e., nucleus) of a hydrogen atom due to the motion of electrons in the

n^{t h}

orbit is proportional to: (

n =

principal quantum number)

EASY

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

The graph that depicts Einstein photoelectric effect for a monochromatic source of frequency above the threshold frequency is

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

If the energies of two light radiations

E_{1}

and

E_{2}

are

25 eV

and

100 eV

respectively, then their respective wavelengths

λ_{1}

and

λ_{2}

would be in the ratio

λ_{1} : λ_{2} =

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

Which of the activities can be compared to the concept of quantisation?

EASY

Chemistry>Physical Chemistry>Structure of Atom>Particle Nature of Electromagnetic Radiations

Calculate the energy in corresponding to light of wavelength

45 n m :

(Planck’s constant

h = 6.63 \times 10^{- 34} J s : s p e e d o f l i g h t c = 3 \times 10^{8} m s^{- 1})

What was the mathematical equation given by Max Planck?

Important Questions on Structure of Atom

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