Which of the following atoms has the lowest ionisation potential?
(a) $_{7}^{14} N$
(b) $_{55}^{133} Cs$
(c) $_{18}^{40} Ar$
(d) $_{8}^{16} O$

The negative Zn pole of Daniell cell, sending a constant current through a circuit, decreases in mass by

0.13 g

30 min

. If the electrochemical equivalent of

Zn

Cu

are

32.5

respectively, the increase in the mass of the positive Cu pole in this time is
(a)

31.5

0.180 g

0.141 g

0.126 g

0.242 g

Topic:

Electric Charges and Fields

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2003

View solution

If the binding energy of the electron in a hydrogen atom is

13.6 eV

, the energy required to remove the electron from the first excited state of

Li^{2 +}

is
(a)

30.6 eV

13.6 eV

3.4 eV

122.4 eV

Topic:

Atoms

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2003

View 7 solutions

The core of any transformer is laminated so as to
(a) reduce the energy loss due to eddy currents
(b) make it light weight
(c) make it robust and strong
(d) increase the secondary voltage

Topic:

Magnetism and Matter

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2003

View solution

If the electric flux entering and leaving an enclosed surface respectively is

ϕ_{1}

, the electric charge inside the surface will be
(a)

ϕ_{2}

(ϕ_{2} - ϕ_{1}) ε_{0}

\frac{( ϕ _{1} + ϕ _{2} )}{ε _{0}}

\frac{( ϕ _{2} - ϕ _{1} )}{ε _{0}}

(ϕ_{1} + ϕ_{2}) ε_{0}

Topic:

Electric Charges and Fields

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2003

View 5 solutions

Practice questions from Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

ion emits two photons in succession, with wavelengths

An excited

He^{+}

108.5 nm

, in making a transition to ground state. The quantum number

30.4 nm

n

corresponding to its initial excited state is [for photon of wavelength

λ

, energy

E = \frac{1240 eV}{λ ( in nm )}

]
(a)

n = 4

n = 5

n = 7

n = 6

Topic:

Atoms

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2019

View 3 solutions

Which of the following curves may represent the speed of the electron in a hydrogen atom as a function of the principal quantum number

n

? (a)

A

B

C

D

Topic:

Atoms

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2008

View solution

An electron from various excited states of hydrogen atom emit radiation to come to the ground state. Let

λ_{n}, λ_{g}

be the de-Broglie wavelength of the electron in the

n

th state and the ground state, respectively. Let

Λ_{n}

be the wavelength of the emitted photon in the transition from the

n

th state to the ground state. For large

n, (A, B

are constants)
(a)

Λ_{n} \approx A + \frac{B}{λ _{n}^{2}}

Λ_{n} \approx A + B λ_{n}^{2}

Λ_{n}^{2} \approx A + B λ_{n}^{2}

Λ_{n}^{2} \approx λ

Topic:

Atoms

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2018

View 11 solutions

The manifestation of band structure in solids is due to
(a) Heisenberg's uncertainty principle
(b) Pauli's exclusion principle
(c) Bohr's correspondence principle
(d) Boltzmann's law

Topic:

Atoms

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2004

View solution

Practice questions from Atoms in the same exam

Which level of the singly ionized carbon has the same energy as the ground state energy of hydrogen atom ?

Topic:

Atoms

Exam:

JEE Mains 2021 Mar 17 Shift 1

View 2 solutions

An electron and proton are separated by a large distance. The electron start approaching the proton with energy

3 eV

. The proton captures the electron and form a hydrogen atom in second excited state. The resulting photon is incident on a photosensitive metal of threshold wavelength

4000 \overset{˚}{A}

. What is the maximum kinetic energy of the emitted photoelectron ?

No photoelectron would be emitted
$1.41 eV$
$7.61 eV$
$3.3 eV$

Topic:

Atoms

Exam:

JEE Mains 2021 July 27 Shift 2

View 6 solutions

, electron in first Bohr orbit is excited to a level by a radiation of wavelength

Li^{++}

λ

. When the ion gets de-excited to the ground state in all possible ways (including intermediate emissions), a total of six spectral lines are observed. What is the value of

λ

? [Take,

h = 6.63 \times 1 0^{- 34} Js; c = 3 \times 1 0^{8} ms^{- 1}

] (a)

9.4 nm

12.3 nm

10.8 nm

11.4 nm

Topic:

Atoms

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2019

View 8 solutions

According to Bohr atom model, in which of the following transitions will the frequency be maximum?

n = 3 to n = 2
n = 5 to n = 4
n = 4 to n = 3
n = 2 to n = 1

Topic:

Atoms

Exam:

JEE Mains 2021 Feb 24 Shift 2

View 2 solutions

Practice more questions from Atoms

Which of the following statements is not correct according to Rutherford model?

Most of the space inside an atom is empty.
The electrons revolve around the nucleus under the influence of coulomb force acting on them.
Most part of the mass of the atom and its positive charge are concentrated at its centre.
The stability of atom was established by the model.

Topic:

Atoms

View 3 solutions

A gas of hydrogen like ions is prepared in such a way that ions are only in the ground state and the first excited state. A monochromatic light of wavelength

1218 \overset{˚}{A}

is absorbed by the ions. The ions are lifted to higher excited states and emit radiation of six wavelength, some higher and some lower than the incident wavelength. Find the principal quantum number of all the excited state. Identify he nuclear charge on the ions Calculate the values of the maximum and minimum wavelengths.

Topic:

Atoms

Book:

Physics Galaxy Optics and Modern Physics Vol 4 (Ashish Arora)

View solution

Binding energy of a nucleus is

Energy given to its nucleus during its formation
Total mass of nucleus converted to energy units
Loss of energy from the nucleus during its formation
Total K.E. and P.E. of the nucleons in the nucleus

Topic:

Atoms

Book:

Fundamentals of Physics, Extended

View 2 solutions

Show that the radius of the orbit in hydrogen atom varies as

n^{2}

, where n is the principal quantum number of the atom.

Topic:

Atoms

Exam:

Class 12th Board 2015

View 3 solutions

Practice questions on similar concepts asked by Filo students

A charged particle is in equilibrium in a uniform vertical electric field of intensity

20 kV / m

. If mass of particle is

9.6 \times 1 0^{- 16} kg

, excess number of electrons on particle is-

(g = 10 m / s^{2})

Topic:

Electrostats

View solution

, equation 2 is modified as

For value

e = 0.6

\Rightarrow v_{n} - v_{n} = 3.6

Solving equations (i) and (iib), we obtain

\Rightarrow v_{A} = - 1.6 m / s

v_{11} = 2.0 m / s

Block

A

reverses back with speed

1.6 m / s

too moves in a direction opposite to its original direction with speed

B

2.0 m / s

. BEGINNER'S BOX-3

A body of mass $2 kg$ makes an elastic collision with another body at rest and continues to move in the original direction with one fourth of its original speed. Find the mass of the second body.
A particle of mass $m$ moving with a velocity $v$ makes a head on elastic collision with another particle of same mass initially at rest. Find the velocity of the first particle after the collision.
A particle of mass $m$ moving with velocity $v$ strikes a stationary particle of mass $2 m$ and sticks to it. Find the speed of the system.
Two putty balls of equal masses moving in mutually perpendicular directions with equal speed, stick together after collision. If the balls were initially moving with a velocity of $452 m / s$ each, find the velocity of the

Topic:

Mechanics

View solution

1. A ball is dropped from the roof of a tower of height

h

. The total distance covered by it in the last second of its motion is equal to the distance covered by it in first three seconds. What is the value of

h

l e f t (g = 10 m / s^{2} i g h t)

[Ans.

125 m

]

Topic:

Mechanics

View solution