The electric field of a plane electromagnetic wave is given by E → = E 0 i ^ c o s k z c o s ( ω t ) The corresponding magnetic field B → is then given by:

B → = E 0 c j ^ sin ⁡ k z s i n ( ω t )

B → = E 0 c j ^ cos ⁡ k z s i n ( ω t )

B → = E 0 c k ^ sin ⁡ k z c o s ( ω t )

B → = E 0 c j ^ sin ⁡ k z c o s ( ω t )

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A radio can tune to any station in $7.5 M H z$ to $12 M H z$ band. The corresponding wavelength band is

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Important Questions on Structure of Atom

EASY

Chemistry>Physical Chemistry>Structure of Atom>Dual Behaviour of Electromagnetic Radiation

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:

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Chemistry>Physical Chemistry>Structure of Atom>Dual Behaviour of Electromagnetic Radiation

A red $L E D$ emits light at $0.1 watt$ uniformly around it. The amplitude of the electric field of the light at a distance of $1 m$ from the diode is:

EASY

Chemistry>Physical Chemistry>Structure of Atom>Dual Behaviour of Electromagnetic Radiation

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}

EASY

Chemistry>Physical Chemistry>Structure of Atom>Dual Behaviour of Electromagnetic Radiation

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}

EASY

Chemistry>Physical Chemistry>Structure of Atom>Dual Behaviour of Electromagnetic Radiation

Write an expression for the speed of light in a material medium of relative permittivity

ε_{r}

and relative magnetic permeability

μ_{r}

EASY

Chemistry>Physical Chemistry>Structure of Atom>Dual Behaviour of Electromagnetic Radiation

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

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Chemistry>Physical Chemistry>Structure of Atom>Dual Behaviour of Electromagnetic Radiation

Which mathematical statement did not prove false?

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Chemistry>Physical Chemistry>Structure of Atom>Dual Behaviour of Electromagnetic Radiation

Taking the wavelength of first Balmer line in hydrogen spectrum

(n = 3

n = 2)

660 n m

, the wavelength of the

2^{n d}

Balmer line

(n = 4

n = 2)

will be :

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Chemistry>Physical Chemistry>Structure of Atom>Dual Behaviour of Electromagnetic Radiation

Electromagnetic waves can be deflected by

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Chemistry>Physical Chemistry>Structure of Atom>Dual Behaviour of Electromagnetic Radiation

Electromagnetic radiation of wavelength

663 nm

is just sufficient to ionise the atom of metal

A

. The ionization energy of metal

A

kJ {mol}^{- 1}

is ___. (Rounded-off to the nearest integer)

[h = 6.63 \times 10^{- 34} Js, c = 3.00 \times 10^{8} {ms}^{- 1}, N_{A} = 6.02 \times 10^{23} {mol}^{- 1}]

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Chemistry>Physical Chemistry>Structure of Atom>Dual Behaviour of Electromagnetic Radiation

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>Dual Behaviour of Electromagnetic Radiation

The electric field of a plane electromagnetic wave is given by

\vec{E} = E_{0} \hat{i} c o s (k z) c o s (ω t)

The corresponding magnetic field

\vec{B}

is then given by:

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Dual Behaviour of Electromagnetic Radiation

If the shortest wavelength in Lyman series of hydrogen atom is

A

, then the longest wavelength in Paschen series of

{He}^{+}

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Chemistry>Physical Chemistry>Structure of Atom>Dual Behaviour of Electromagnetic Radiation

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

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Chemistry>Physical Chemistry>Structure of Atom>Dual Behaviour of Electromagnetic Radiation

The first member of the Balmer series of hydrogen atom has a wavelength of

6561 \overset{\circ}{A}

. The wavelength of the second member of the Balmer series (in nm) is_____________

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Chemistry>Physical Chemistry>Structure of Atom>Dual Behaviour of Electromagnetic Radiation

The ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about

9

. The spectral series are:

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Chemistry>Physical Chemistry>Structure of Atom>Dual Behaviour of Electromagnetic Radiation

For any given series of spectral lines of atomic hydrogen, let $Δ \bar{v} = {\bar{v}}_{m a x} - {\bar{v}}_{m i n}$ be the difference in maximum and minimum wave number in $c m^{- 1}$ .

The ratio $Δ {\bar{v}}_{L y m a n} / Δ {\bar{v}}_{B a l m a r}$ is

EASY

Chemistry>Physical Chemistry>Structure of Atom>Dual Behaviour of Electromagnetic Radiation

A particular station of All India Radio, New Delhi, broadcasts on a frequency of

1, 368 kHz

(kilo Hertz). The wavelength of the electromagnetic radiation emitted by the transmitter is [speed of light,

c = 3.0 \times 10^{8} {ms}^{- 1}

]

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Chemistry>Physical Chemistry>Structure of Atom>Dual Behaviour of Electromagnetic Radiation

What do you understand by the statement, “Electromagnetic waves transport momentum”?

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Chemistry>Physical Chemistry>Structure of Atom>Dual Behaviour of Electromagnetic Radiation

An electromagnetic wave is represented by the electric filed

\vec{E} = E_{0} \hat{n} \sin [ω t + (6 y - 8 z)] .

Taking unit vectors in

x, y

and

z

directions to be

\hat{i}, \hat{j}, \hat{k},

the directions of propagations

\hat{s},

is:

A radio can tune to any station in 7.5 MHz to 12 MHz band. The corresponding wavelength band is

Important Questions on Structure of Atom

Learn and Prepare for any exam you want !

A radio can tune to any station in $7.5 M H z$ to $12 M H z$ band. The corresponding wavelength band is