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PHXII12:ATOMS

356477 The total energy of an $e^{-}$ in the second orbit of $H$ -atom is $- 3.4 e V$ . Its potential energy is:

1

+ 3.4 e V

2

+ 6.8 e V

3

- 6.8 e V

4

- 1.7 e V

Explanation:

$P . E . = 2 T . E . = 2 \times (- 3.4) = - 6.8 e V .$

PHXII12:ATOMS

356478 When an electron in hydrogen atom revolves in stationary orbit, it

1 Does not radiate light through its velocity changes

2 Does not radiate light and velocity remains unchanged

3 Radiates light but its velocity is unchanged

4 Radiates light with the change of energy

MHTCET - 2016

PHXII12:ATOMS

356479 The energy $E$ of a hydrogen atom with principal quantum number $n$ is given by $E = \frac{13.6}{n^{2}} e V$ . The energy of a photon ejected when the electron jumps from $n = 3$ state to $n = 2$ state of hydrogen is approximately

1

1.5 e V

2

0.85 e V

3

3.3 e V

4

1.9 e V

Explanation:

The energy of ejected photon,
$E = R h c (\frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}})$
where, transistion takes place from $n_{1}$ to $n_{2}$ .
$= 13.6 (\frac{1}{2^{2}} - \frac{1}{3^{2}})$
$= 13.6 \times \frac{5}{36} = 1.9 e V$

AIIMS - 2013

PHXII12:ATOMS

356480 The radius of inner most orbit of hydrogen atom is $5.3 \times 10^{- 11} m$ . What is the radius of third allowed orbit of hydrogen atom?

1 1.06

A^{\circ}

2 1.59

A^{\circ}

3 4.77

A^{\circ}

4 0.53

A^{\circ}

Explanation:

Radius of $n^{th}$ orbit in Hydrogen Atom
$r_{n} = 0.53 \times \frac{n^{2}}{Z} \overset{^{\circ}}{A}$
For $H, Z = 1$
$\Rightarrow$ Radius of third orbit
$r_{3} = 0.53 \times \frac{{(3)}^{2}}{(1)} \overset{^{\circ}}{A} = 4.77 \overset{^{\circ}}{A}$
Correct option is (3).

NEET - 2023

PHXII12:ATOMS

356477 The total energy of an $e^{-}$ in the second orbit of $H$ -atom is $- 3.4 e V$ . Its potential energy is:

1

+ 3.4 e V

2

+ 6.8 e V

3

- 6.8 e V

4

- 1.7 e V

Explanation:

$P . E . = 2 T . E . = 2 \times (- 3.4) = - 6.8 e V .$

PHXII12:ATOMS

356478 When an electron in hydrogen atom revolves in stationary orbit, it

1 Does not radiate light through its velocity changes

2 Does not radiate light and velocity remains unchanged

3 Radiates light but its velocity is unchanged

4 Radiates light with the change of energy

MHTCET - 2016

PHXII12:ATOMS

356479 The energy $E$ of a hydrogen atom with principal quantum number $n$ is given by $E = \frac{13.6}{n^{2}} e V$ . The energy of a photon ejected when the electron jumps from $n = 3$ state to $n = 2$ state of hydrogen is approximately

1

1.5 e V

2

0.85 e V

3

3.3 e V

4

1.9 e V

Explanation:

The energy of ejected photon,
$E = R h c (\frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}})$
where, transistion takes place from $n_{1}$ to $n_{2}$ .
$= 13.6 (\frac{1}{2^{2}} - \frac{1}{3^{2}})$
$= 13.6 \times \frac{5}{36} = 1.9 e V$

AIIMS - 2013

PHXII12:ATOMS

356480 The radius of inner most orbit of hydrogen atom is $5.3 \times 10^{- 11} m$ . What is the radius of third allowed orbit of hydrogen atom?

1 1.06

A^{\circ}

2 1.59

A^{\circ}

3 4.77

A^{\circ}

4 0.53

A^{\circ}

Explanation:

Radius of $n^{th}$ orbit in Hydrogen Atom
$r_{n} = 0.53 \times \frac{n^{2}}{Z} \overset{^{\circ}}{A}$
For $H, Z = 1$
$\Rightarrow$ Radius of third orbit
$r_{3} = 0.53 \times \frac{{(3)}^{2}}{(1)} \overset{^{\circ}}{A} = 4.77 \overset{^{\circ}}{A}$
Correct option is (3).

NEET - 2023

PHXII12:ATOMS

356477 The total energy of an $e^{-}$ in the second orbit of $H$ -atom is $- 3.4 e V$ . Its potential energy is:

1

+ 3.4 e V

2

+ 6.8 e V

3

- 6.8 e V

4

- 1.7 e V

Explanation:

$P . E . = 2 T . E . = 2 \times (- 3.4) = - 6.8 e V .$

PHXII12:ATOMS

356478 When an electron in hydrogen atom revolves in stationary orbit, it

1 Does not radiate light through its velocity changes

2 Does not radiate light and velocity remains unchanged

3 Radiates light but its velocity is unchanged

4 Radiates light with the change of energy

MHTCET - 2016

PHXII12:ATOMS

356479 The energy $E$ of a hydrogen atom with principal quantum number $n$ is given by $E = \frac{13.6}{n^{2}} e V$ . The energy of a photon ejected when the electron jumps from $n = 3$ state to $n = 2$ state of hydrogen is approximately

1

1.5 e V

2

0.85 e V

3

3.3 e V

4

1.9 e V

Explanation:

The energy of ejected photon,
$E = R h c (\frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}})$
where, transistion takes place from $n_{1}$ to $n_{2}$ .
$= 13.6 (\frac{1}{2^{2}} - \frac{1}{3^{2}})$
$= 13.6 \times \frac{5}{36} = 1.9 e V$

AIIMS - 2013

PHXII12:ATOMS

356480 The radius of inner most orbit of hydrogen atom is $5.3 \times 10^{- 11} m$ . What is the radius of third allowed orbit of hydrogen atom?

1 1.06

A^{\circ}

2 1.59

A^{\circ}

3 4.77

A^{\circ}

4 0.53

A^{\circ}

Explanation:

Radius of $n^{th}$ orbit in Hydrogen Atom
$r_{n} = 0.53 \times \frac{n^{2}}{Z} \overset{^{\circ}}{A}$
For $H, Z = 1$
$\Rightarrow$ Radius of third orbit
$r_{3} = 0.53 \times \frac{{(3)}^{2}}{(1)} \overset{^{\circ}}{A} = 4.77 \overset{^{\circ}}{A}$
Correct option is (3).

NEET - 2023

PHXII12:ATOMS

356477 The total energy of an $e^{-}$ in the second orbit of $H$ -atom is $- 3.4 e V$ . Its potential energy is:

1

+ 3.4 e V

2

+ 6.8 e V

3

- 6.8 e V

4

- 1.7 e V

Explanation:

$P . E . = 2 T . E . = 2 \times (- 3.4) = - 6.8 e V .$

PHXII12:ATOMS

356478 When an electron in hydrogen atom revolves in stationary orbit, it

1 Does not radiate light through its velocity changes

2 Does not radiate light and velocity remains unchanged

3 Radiates light but its velocity is unchanged

4 Radiates light with the change of energy

MHTCET - 2016

PHXII12:ATOMS

356479 The energy $E$ of a hydrogen atom with principal quantum number $n$ is given by $E = \frac{13.6}{n^{2}} e V$ . The energy of a photon ejected when the electron jumps from $n = 3$ state to $n = 2$ state of hydrogen is approximately

1

1.5 e V

2

0.85 e V

3

3.3 e V

4

1.9 e V

Explanation:

The energy of ejected photon,
$E = R h c (\frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}})$
where, transistion takes place from $n_{1}$ to $n_{2}$ .
$= 13.6 (\frac{1}{2^{2}} - \frac{1}{3^{2}})$
$= 13.6 \times \frac{5}{36} = 1.9 e V$

AIIMS - 2013

PHXII12:ATOMS

356480 The radius of inner most orbit of hydrogen atom is $5.3 \times 10^{- 11} m$ . What is the radius of third allowed orbit of hydrogen atom?

1 1.06

A^{\circ}

2 1.59

A^{\circ}

3 4.77

A^{\circ}

4 0.53

A^{\circ}

Explanation:

Radius of $n^{th}$ orbit in Hydrogen Atom
$r_{n} = 0.53 \times \frac{n^{2}}{Z} \overset{^{\circ}}{A}$
For $H, Z = 1$
$\Rightarrow$ Radius of third orbit
$r_{3} = 0.53 \times \frac{{(3)}^{2}}{(1)} \overset{^{\circ}}{A} = 4.77 \overset{^{\circ}}{A}$
Correct option is (3).

NEET - 2023