Physics Crash Course JEE Main>Chapter 21 - Atoms and Nuclei>Level 1>Q 6

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Earn 100

Frequency of revolution of an electron revolving in n^th orbit of H-atom is proportional to

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Important Questions on Atoms and Nuclei

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Physics Crash Course JEE Main>Chapter 21 - Atoms and Nuclei>Level 1>Q 7

Two nucleons are at a separation of

1 \times 10^{- 15} m

. The net force(nuclear) between them is

F_{1}

if both are neutrons,

F_{2}

if both are protons and

F_{3}

if one is a proton and other is a neutron. In such a case,

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Physics Crash Course JEE Main>Chapter 21 - Atoms and Nuclei>Level 1>Q 10

In the figure, six lines of emission spectrum are shown. Which of them will be absent in the absorption spectrum?

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Physics Crash Course JEE Main>Chapter 21 - Atoms and Nuclei>Level 1>Q 12

One of the lines in the emission spectrum of

L i^{2 +}

has the same wavelength as that of the

2^{nd}

line of Balmer series in hydrogen spectrum. The electronic transition corresponding to this line is:

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Physics Crash Course JEE Main>Chapter 21 - Atoms and Nuclei>Level 1>Q 13

The Hitomi satellite recently observed the Lyman alpha emission line

(n = 2 to n = 1)

of Hydrogen-like iron ion (atomic number of iron is

26

) from the Perseus galaxy cluster. The wavelength of the line is closest to,

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Physics Crash Course JEE Main>Chapter 21 - Atoms and Nuclei>Level 1>Q 14

Out of following spectral series of the Hydrogen spectrum, the one which lies wholly in the ultraviolet region is

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Physics Crash Course JEE Main>Chapter 21 - Atoms and Nuclei>Level 1>Q 16

M_{p}

denotes the mass of a proton and

M_{n}

denotes that of a neutron. A given nucleus of binding energy $B$ contains

Z

protons and $N$ neutrons. The mass $M (N, Z)$ of the nucleus is given by ( $c$ is velocity of light),

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Physics Crash Course JEE Main>Chapter 21 - Atoms and Nuclei>Level 1>Q 17

In a fission reaction,

U_{92}^{236} \overset{}{\to} X^{117} + Y^{117} + n + n

, the binding energy per nucleon of

X and Y

is

8.5 MeV

each, whereas that of

U^{236}

is

7.6 MeV

. The total energy liberated will be about:

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IMPORTANT

Physics Crash Course JEE Main>Chapter 21 - Atoms and Nuclei>Level 1>Q 18

Calculate the mass defect when three

α

-particles combined to form a

C^{12}

nucleus (Atomic mass of

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

is

4.002603 u

)