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A 600 W mercury lamp emits monochromatic radiation of wavelength 331.3 nm. How many photons are emitted from the lamp per second?
( $h = 6.626 \times 1 0^{- 34}$ Js; velocity of light $= 3 \times 1 0^{8} m s^{- 1}$ )

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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 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}

)

EASY

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

If the work function for the photoelectron emission of a metal is

3.75 eV

, then the threshold wave length of the radiation needed for the ejection of the electron is approximately

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

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 wavelengths of two photons are

2000 Å

and

4000 Å

, respectively. What is the ratio of their energies?

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

The value of Planck's constant in electron volts

(eV)

is _______

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

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

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

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

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})

EASY

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

The value of Planck's constant is

6 .63 \times 10^{- 34} Js

and the velocity of light is

3 .0 \times 10^{8} {ms}^{- 1}

. Which value is the closest to the wavelength in nanometers of a quantum of light, with a frequency of

8 \times 10^{15} s^{- 1}

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

In a Photoelectric effect experiment, frequency of incident radiation is increased by keeping other factors constant

(f > f_{0})

.The stopping potential

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

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)

MEDIUM

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

Upon irradiation with radiation of a suitable wavelength on the cathode, the photocurrent produced was reduced to zero by applying a stopping potential of

2.63 V .

If the work function of the cathode is

4.3 eV,

find the approximate wavelength of the radiation (in

nm

)

HARD

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

The figure that is not a direct manifestation of the quantum nature of atom 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

A 600 W mercury lamp emits monochromatic radiation of wavelength 331.3 nm. How many photons are emitted from the lamp per second? ( h=6.626×10-34 Js; velocity of light =3×108 ms-1 )

Important Questions on Structure of Atom

Learn and Prepare for any exam you want !

A 600 W mercury lamp emits monochromatic radiation of wavelength 331.3 nm. How many photons are emitted from the lamp per second?
( $h = 6.626 \times 1 0^{- 34}$ Js; velocity of light $= 3 \times 1 0^{8} m s^{- 1}$ )