MEDIUM

Earn 100

An object emits two different radiation, when it absorbs certain amount of energy having $2400 \overset{o}{A}$ of wavelength in which one radiation having $6000 \overset{o}{A} .$ What is the wavelength of other radiation?

63.38% studentsanswered this correctly

Important Questions on Structure of Atom

EASY

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

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

HARD

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

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

HARD

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

The "Kangri" is an earthen pot used to stay warm in Kashmir during the winter months. Assume that the "Kangri" is spherical and of surface area

7 \times 10^{- 2} m^{2} .

It contains

300 g

of a mixture of coal, wood and leaves with calorific value of

30 kJ g^{- 1}

(and provides heat with

10 %

efficiency). The surface temperature of the 'Kangri' is

60 ° C

and the room temperature is

0 ° C .

Then, a reasonable estimate for the duration t (in hours) that the 'kangri' heat will last is (take the 'kangri' to be a black body):

EASY

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

Electrons of mass,

m

with de-Broglie wavelength,

λ

fall on the target in an X-ray tube. The cutoff wavelength,

(λ_{0})

of the emitted X-ray 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 energy of the em waves is of the order of

15 keV

. To which part of the spectrum does it belong?

HARD

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

A certain stellar body has radius

50 R_{s}

and temperature

2 T_{s}

and is at a distance of

2 \times 10^{10} AU

from the earth. Here,

AU

refers to the earth-sun distance and

R_{s}

and

T_{s}

refer to the sun's radius and temperature, respectively. Take, both star and sun to be ideal black bodies. The ratio of the power received on earth from the stellar body as compared to that received from the sun is close to

EASY

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

Arrange the following electromagnetic radiations per quantum in the order of increasing energy:

A :

Blue light

B :

Yellow light

C :

X-ray

D :

Radiowave

EASY

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

Anaemia can be diagnosed by:

EASY

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

Which of the following is the correct unit of angular momentum of an electron in an orbital of an atom ?

MEDIUM

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

Which of the following statements is false?

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}

]

EASY

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

Match List - I (Electromagnetic wave type) with List - II (Its association/application) and select the correct option from the choices given below the lists :

	List - I		List - II
(a)	Infrared waves	(i)	To treat muscular strain
(b)	Radio waves	(ii)	For broadcasting
(c)	X - rays	(iii)	To detect fracture of bones
(d)	Ultraviolet rays	(iv)	Absorbed by the ozone layer of the atmosphere

MEDIUM

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

The power radiated by a black body is P and it radiates maximum energy at wavelength,

λ_{0}

. If the temperature of the black body is now changed so that it radiates maximum energy at wavelength

\frac{3}{4} λ_{0}

, the power radiated by it becomes nP. The value of n is

EASY

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

If microwaves,

X ‐

rays, infrared, gamma rays, ultraviolet, radio waves and visible parts of the electromagnetic spectrum are denoted respectively by

M

X

I

G

U

R

and

V

the following is the arrangement in ascending order of the wavelength

EASY

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

78) There are two statements, one labelled as Assertion (A) and the other as Reason (R). Examine both the statements carefully and mark the correct choice.
(A) Hydrogen has one electron in its orbit but it produces several spectral lines.
(R) There are many excited energy levels available.

HARD

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

The correct representation of wavelength intensity relationship of an ideal black body radiation at two different temperatures

T_{1}

and

T_{2}

MEDIUM

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

A spherical black body with a radius of

12 cm

radiates

450 W

power at

500 K

. If the radius were halved and the temperature doubled, the power radiated in watt would be

EASY

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

Which mathematical statement did not prove false?

MEDIUM

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}]

An object emits two different radiation, when it absorbs certain amount of energy having 2400 Ao of wavelength in which one radiation having 6000 Ao. What is the wavelength of other radiation?

Important Questions on Structure of Atom

Learn and Prepare for any exam you want !

An object emits two different radiation, when it absorbs certain amount of energy having $2400 \overset{o}{A}$ of wavelength in which one radiation having $6000 \overset{o}{A} .$ What is the wavelength of other radiation?