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Questions and Answers
What is the ratio of the maximum to the minimum photocurrent that can be passed through the circuit?
What is the ratio of the maximum to the minimum photocurrent that can be passed through the circuit?
- 9 : 5
- 5 : 4
- 9 : 2 (correct)
- 9 : 4
What is the minimum possible wavelength of the photoelectron?
What is the minimum possible wavelength of the photoelectron?
- 480Å
- 30Å
- 120Å (correct)
- 680Å
What is the value of Z in the given equation?
What is the value of Z in the given equation?
- 2
- 5
- 3 (correct)
- 4
What is the value of the radial node in the given equation?
What is the value of the radial node in the given equation?
What is the minimum photocurrent that must be passed through the circuit?
What is the minimum photocurrent that must be passed through the circuit?
What is the circumference of the second orbit of an atom or ion having a single electron?
What is the circumference of the second orbit of an atom or ion having a single electron?
What is the energy of the first photon emitted when the atom transitions from the higher excited state to the first excited state?
What is the energy of the first photon emitted when the atom transitions from the higher excited state to the first excited state?
What is the angular node of the 2p orbital in the hydrogen atom?
What is the angular node of the 2p orbital in the hydrogen atom?
What is the energy of the photon emitted when the electron moves from the (n + 1) to the ground state?
What is the energy of the photon emitted when the electron moves from the (n + 1) to the ground state?
What is the region of the electromagnetic spectrum where the Lyman series is observed?
What is the region of the electromagnetic spectrum where the Lyman series is observed?
What is the radial node of the 2s orbital in the hydrogen atom?
What is the radial node of the 2s orbital in the hydrogen atom?
What happens to the energy of an electron accelerated by a potential difference of 5.0 V when it collides with a Hg atom?
What happens to the energy of an electron accelerated by a potential difference of 5.0 V when it collides with a Hg atom?
What is the energy of the second photon emitted when the atom transitions from the higher excited state to the first excited state?
What is the energy of the second photon emitted when the atom transitions from the higher excited state to the first excited state?
If a ruby laser produces 0.36 J of energy per pulse, what can be said about the number of photons produced in each pulse?
If a ruby laser produces 0.36 J of energy per pulse, what can be said about the number of photons produced in each pulse?
What is the effect of halving the intensity of light on the maximum kinetic energy of electrons emitted by a metal surface?
What is the effect of halving the intensity of light on the maximum kinetic energy of electrons emitted by a metal surface?
What is the relationship between the radius of the second orbit of a H-atom and that of a He+ ion?
What is the relationship between the radius of the second orbit of a H-atom and that of a He+ ion?
When an electron jumps from the second orbit to the fourth orbit in a H-atom, what happens to its distance from the nucleus?
When an electron jumps from the second orbit to the fourth orbit in a H-atom, what happens to its distance from the nucleus?
What is the wavelength of the light emitted by a Hg-atom when an electron accelerated by a potential difference of 5.0 V collides with it?
What is the wavelength of the light emitted by a Hg-atom when an electron accelerated by a potential difference of 5.0 V collides with it?
What is the kinetic energy of an electron in the second Bohr orbit of a hydrogen atom?
What is the kinetic energy of an electron in the second Bohr orbit of a hydrogen atom?
What is the radius of the first orbit of a D-atom?
What is the radius of the first orbit of a D-atom?
What is the energy of an electron in the first Bohr's orbit of an H-atom?
What is the energy of an electron in the first Bohr's orbit of an H-atom?
Which of the following statements is correct about the Bohr's model of a hydrogen atom?
Which of the following statements is correct about the Bohr's model of a hydrogen atom?
What happens to the kinetic energy of an electron when it jumps from the fourth orbit to the second orbit in a Be³⁺ ion?
What happens to the kinetic energy of an electron when it jumps from the fourth orbit to the second orbit in a Be³⁺ ion?
For which orbit in a He⁺ ion is the circumference 26.5 Å?
For which orbit in a He⁺ ion is the circumference 26.5 Å?
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Study Notes
Atomic Structure
- Centripetal force of an electron in the n = 2 orbit is more than that in the n = 1 orbit.
Photocurrent
- Three laser guns with powers 2, 3, and 5 W are used to produce photocurrent from a metal plate.
- The number of photons emitted by the laser guns are 4 × 10^18, 5 × 10^18, and 9 × 10^18 per second.
- The metal plate has a threshold energy of 4.5 × 10^-19 J.
Wavelength of Photoelectron
- Minimum possible wavelength of a photoelectron is 680Å or 30Å.
Hydrogen-Like Atom
- A hydrogen-like atom (atomic number Z) is in a higher excited state of quantum number n.
- The excited atom can make a transition to the first excited state by successively emitting two photons of energies 10.20 and 17.00 eV, respectively.
- Alternatively, the atom from the same excited state can make a transition to the second excited state by successively emitting two photons of energies 4.25 and 5.95 eV, respectively.
Schrödinger Wave Equation
- The Schrödinger wave equation for a hydrogen atom is Ψ2s = (1/2) (4√2π/a0) (2 - r0/a0) e^(-r/a0).
Matrices
- Match the columns: Orbitals (2s, 1s, 2p, 3p) with Nodal properties (Radial node = 0, Angular node = 1, Radial node = 1, Angular node = 0).
Hydrogen Atom Spectrum
- Match Column I with Column II: Lyman series (UV region), Balmer series (Visible region), Paschen series (IR region), Brackett series (IR region).
Atomic Radius
- The radius of the second orbit of an H-atom is equal to the radius of the second orbit of a He+ ion.
- The radius of the first orbit of an H-atom is 0.529 Å.
- The radius of the first orbit of a D-atom is slightly less than 0.529 Å.
Electron Energy
- The energy of an electron in the first Bohr's orbit of an H-atom is -13.6 eV.
- Possible energy values of the excited state(s) for electrons in Bohr's orbits to hydrogen are -3.4 eV, -10.2 eV, -1.51 eV, and -0.85 eV.
Bohr's Model
- The acceleration of the electron in the n = 2 orbit is more than that in the n = 1 orbit.
- The angular momentum of the electron in the n = 2 orbit is more than that in the n = 1 orbit.
- The kinetic energy of an electron in the n = 2 orbit is less than that in the n = 1 orbit.
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