Physics Crash Course MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 132

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A photon is emitted by a hydrogen atom when it comes from excited state $n = 5$ to the ground state. The recoil speed is almost

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Important Questions on Atoms, Molecules and Nuclei

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Physics Crash Course MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 133

Two elements

A

and

B

with atomic numbers

Z_{A}

and

Z_{B}

are used to produce characteristic

X

-rays with frequencies

ν_{A}

and

ν_{B}

, respectively. If

Z_{A} : Z_{B} = 1 : 2

, then

ν_{A} : ν_{B}

will be

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Physics Crash Course MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 134

The amount of energy required to separate a hydrogen atom into a proton and an electron is

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Physics Crash Course MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 135

An electron in a hydrogen atom makes a transition from first excited state to ground state. The equivalent current due to circulating electron

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Physics Crash Course MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 136

The wavelength of the first Balmer line caused by a transition from the

n = 3

level to the

n = 2

level in hydrogen is

λ_{1}

. The wavelength of the line caused by an electronic transition from

n = 5

to

n = 3

is,

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Physics Crash Course MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 137

The ionization potential of hydrogenic ions

P

and

Q

are

V_{P}

and

V_{Q}

respectively. If

V_{Q} < V_{P}

then radii

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Physics Crash Course MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 138

The ionization potential of

H

-atom is

13.6 eV

. The

H

-atoms in the ground state are excited by monochromatic radiations of photon of energy

12.09 eV

. Then the number of spectral lines emitted by the excited atoms will be

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Physics Crash Course MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 139

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 MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 140

The largest wavelength in the ultraviolet region of the hydrogen spectrum is

122 nm

. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer) is