STANDARD Physics Structure Of Atom Class 11 Questions

In the Geiger-Marsden scattering experiment, in case of head-on collision the impact parameter should be

The graph of the total number of α-particles scattered at different angles in a given interval of time for α-particle scattering in the Geiger-Marsden experiment is given by

The volume occupied by an atom is greater than the volume of the nucleus by a factor of about

Which of the following spectral series falls within the visible range of electromagnetic radiation?

The shortest wavelength present in the Paschen series of spectral lines is (R = 1.097 × 10⁷ m⁻¹)

The radius of first Bohr's orbit for hydrogen is 0.53 Å. The radius of third Bohr's orbit would be

The relation between the orbital radius and the electron velocity for a dynamically stable orbit in a hydrogen atom is (where, all notations have their usual meanings)

According to Bohr's theory, the wave number of last line of Balmer series is (R = 1.1 × 10⁷ m⁻¹)

The first line of the Lyman series in a hydrogen spectrum has a wavelength of 1210 Å. The corresponding line of a hydrogen-like atom of Z = 11 is equal to

What is the ratio of the shortest wavelength of the Balmer series to the shortest wavelength of the Lyman series?

If the wavelength of the first line of the Balmer series of hydrogen is 6561 Å, the wavelength of the second line of the series should be

If v₁ is the frequency of the series limit of Lyman series, v₂ is the frequency of the first line of Lyman series and v₃ is the frequency of the series limit of the Balmer series, then

Match the correct pairs.

The angular speed of the electron in the nᵗʰ orbit of Bohr's hydrogen atom is

The electric current I created by the electron in the ground state of H atom using Bohr model in terms of Bohr radius (a₀) and velocity of electron in first orbit v₀ is

Which of the following statements is true for hydrogen atom?

The radius of nᵗʰ orbit rₙ in terms of Bohr radius (a₀) for a hydrogen atom is given by the relation

In a hydrogen atom the total energy of electron is

In which of the following Bohr's orbit (n) a hydrogen atom emits the photons of lowest frequency?

The transition from the state n = 3 to n = 1 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from

If E is the energy of nᵗʰ orbit of hydrogen atom the energy of nᵗʰ orbit of He atom will be

The energy required to excite an electron in hydrogen atom to its first excited state is

A triply ionized beryllium Be³⁺ has the same orbital radius as the ground state of hydrogen. Then the quantum state n of Be³⁺ is

In the previous question, find the potential energy of electron (in Joule) in the given state.

If speed of electron in ground state energy level is 2.2 × 10⁶ m s⁻¹, then its speed in third excited state will be

An electron is revolving in the nᵗʰ orbit of radius 4.2 Å, then the value of n is (r₁ = 0.529 Å)

An electron is in an excited state in a hydrogen like atom. It has a total energy of –3.4 eV. The kinetic energy of the electron is E and its de-Broglie wavelength is λ. Then

The diagram shows the energy levels for an electron in a certain atom. Which transition shown represents the emission of a photon with the most energy?

In a hydrogen atom, the radius of nᵗʰ Bohr orbit is rₙ. The graph between log(rₙ/r₁) and log n will be

An electron in a hydrogen atom makes a transition from n = n₁ to n = n₂. The time period of the electron in the initial state is eight times that in the final state. The possible values of n₁ and n₂ are

A hydrogen atom and a Li⁺⁺ ion are both in the second excited state. If lₕ and lₗᵢ are their respective electronic angular momenta and Eₕ and Eₗᵢ their respective energies, then

The orbital angular momentum for an electron revolving in an orbit is given by \(\sqrt{l(l+1)} \frac{h}{2\pi}\). This momentum for an s-electron will be given by

An electron in the ground state of hydrogen atom is revolving in anticlockwise direction in circular orbit of radius R. The orbital magnetic dipole moment of the electron will be

The de-Broglie wavelength of an electron in the first Bohr orbit is

Hydrogen atom from excited state comes to the ground state by emitting a photon of wavelength λ. If R is the Rydberg constant, then the principal quantum number n of the excited state is