Match List-I (Fundamental Experiment) with List-II (its conclusion) and select the correct option from the choices given below the list: List-I List-II (a) Franck-Herfz experiment (i) Particle nature of light (b) Photo-electric experiment (ii) Discrete energy levels of atom (c) Davison-Germer experiment (iii) Wave nature of electron (iv) Structure of atom

( a ) - ( ii ) (b) - ( i ) (c) - (iii)

( a ) - ( i ) ( b ) - ( i v ) ( c ) - ( i i i )

( a ) - ( i i ) ( b ) - ( i v ) ( c ) - ( i i i )

( a ) - ( i v ) (b) - ( iii ) (c) - (ii)

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Earn 100

The number of de-Broglie wavelengths contained in the second Bohr orbit of the hydrogen atom is.

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Important Questions on Atoms, Molecules and Nuclei

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 12 - Atoms, Molecules and Nuclei>Competitive Thinking>Q 188

Match List-I (Fundamental Experiment) with List-II (its conclusion) and select the correct option from the choices given below the list:

	List-I		List-II
(a)	Franck-Herfz experiment	(i)	Particle nature of light
(b)	Photo-electric experiment	(ii)	Discrete energy levels of atom
(c)	Davison-Germer experiment	(iii)	Wave nature of electron
		(iv)	Structure of atom

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 12 - Atoms, Molecules and Nuclei>Evaluation Test>Q 1

Two radioactive materials,

X_{1}

and

X_{2}

have decay constants

5 λ

and

λ

, respectively. If initially, they have the same number of nuclei, then the ratio of the number of nuclei of

X_{1}

to that of

X_{2}

will be

\frac{1}{e}

after time equal to,

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IMPORTANT

MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 12 - Atoms, Molecules and Nuclei>Evaluation Test>Q 2

An electron in the ground state of a hydrogen atom is revolving in anticlockwise direction in the circular orbit of radius $R$ . The atom is placed in a uniform magnetic induction $B$ such that the plane normal of the electron orbit makes an angle $60 °$ with the magnetic induction. The torque experienced by the electron is,

Question Image

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IMPORTANT

MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 12 - Atoms, Molecules and Nuclei>Evaluation Test>Q 3

What amount of energy should be added to an electron to reduce its de-Broglie wavelength from

200 pm

100 pm

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 12 - Atoms, Molecules and Nuclei>Evaluation Test>Q 4

In the process of nuclear fission of

1 g

uranium, the mass lost is

0.90

milligram. The efficiency of power station run by it is

10 %

. To obtain

200

megawatt. power from the power station, the uranium required per hour is

(c = 3 \times 10^{8} m s^{- 1})

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 12 - Atoms, Molecules and Nuclei>Evaluation Test>Q 5

Assertion: Lyman series lies in the visible region of electromagnetic spectrum.

Reason: This is because Balmer series also lies in visible region.

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 12 - Atoms, Molecules and Nuclei>Evaluation Test>Q 8

The average life time of a hydrogen atom excited to

n = 2

state is

10^{- 8} s

. The period of revolution of the electron on an average before it jumps to ground state is,

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 12 - Atoms, Molecules and Nuclei>Evaluation Test>Q 9

The binding energy per nucleon for

{}_{1}H^{2}

and

{}_{2}{He}^{4}

are

1.1 MeV

and

7.1 MeV

, respectively. The energy released when two

{}_{1}H^{2}

combine to form

{}_{2}{He}^{4}

is,

The number of de-Broglie wavelengths contained in the second Bohr orbit of the hydrogen atom is.

Important Questions on Atoms, Molecules and Nuclei

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