A level Modern Physics and the Atom Quiz 1

16 Questions

Quiz Description

Modern Physics, the most recent branch of Physics, was developed in the early 20th century and has been developing to date. In this quiz, you will learn a lot of exciting things like the basics of thermodynamics, relativity, quantum mechanics, atomic physics, nuclear physics, particle physics, and cosmology. University Physics with Modern Physics by Young and Freedman (essential) This part of Physics helps students understand the fundamental forces of the universe and how they interact to the atomic level.

Modern physics is simply a branch of physics that deals with exactly the opposite of what classical physics teaches us. Compared to classical Physics, modern physics deals with more new and updated theories developed in the 20th century and involves elements of quantum mechanics and Einsteinian relativity. These theories will open your mind to more natural and realistic things as concern the universe as a whole. 

You will find 15 questions under this quiz which will test your knowledge of Modern Physics, be sure to take and learn from them as these questions are exam standard MCQs with 4 options each.
Good luck! 

1:

The total energy of the electron in the hydrogen atom in the ground state is -13.6 eV. Which of the following is its kinetic energy in the first excited state?


Correct
  • 1:
    13.6 eV
  • 2:
    6.8 eV
  • 3:
    3.4 eV
  • 4:
    1.825 eV
2:

A freshly prepared radioactive source of half life 2 hrs emits radiation of intensity which is 32 times the permissible safe value of intensity. Which of the following is the minimum time after which it would be possible to work safely with this source?


Correct
  • 1:
    16 hrs
  • 2:
    5 hrs
  • 3:
    10 hrs
  • 4:
    32 hrs
3:

The ionisation potential of a hydrogen atom is 13.6 volt. The energy required to remove an electron from the second orbit of hydrogen is:


Correct
  • 1:
    3.4 eV
  • 2:
    6.8 eV
  • 3:
    13.6 eV
  • 4:
    27.2 eV
4:

The ionisation energy of the ionised sodium atom Na+10 is :


Correct
  • 1:
    13.6 eV
  • 2:
    13.6 x 11 eV
  • 3:
    (13.6/11) eV
  • 4:
    13.6 x (11^2) eV
5:

Radius of the second Bohr orbit of a singly ionised helium atom is


Correct
  • 1:
    0.53 Ao
  • 2:
    1.06 Ao
  • 3:
    0.265 Ao
  • 4:
    0.132 Ao
6:

The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation:


Correct
  • 1:
    the maximum wavelength increases
  • 2:
    the minimum wave length increases
  • 3:
    the minimum wavelength remains unchanged
  • 4:
    the minimum wave length decreases
7:

A beam of electrons accelerated by a large potential difference V is made to strike a metal target to produce X-rays. For which of the following values of V, the resulting X-rays have the lowest minimum wave length:


Correct
  • 1:
    10 KV
  • 2:
    20 KV
  • 3:
    30 KV
  • 4:
    40 KV
8:

The relation between half-life T of a radioactive sample and its mean life τ is:


Correct
  • 1:
    T = 0.693 τ
  • 2:
    τ = 0.693 T
  • 3:
    τ = T
  • 4:
    τ = 2.718 T
9:

The stopping potential for the photo electrons emitted from a
metal surface of work function 1.7 eV is 10.4 V. Identify the energy levels corresponding to the transitions in hydrogen atom which will result in emission of wavelength equal to that of incident radiation for the above photoelectric effect


Correct
  • 1:
    n = 3 to 1
  • 2:
    n = 3 to 2
  • 3:
    n = 2 to 1
  • 4:
    n = 4 to 1
10:

An electron collides with a fixed hydrogen atom in its ground state. Hydrogen atom gets excited and the colliding electron loses all its kinetic energy. Consequently the hydrogen atom may emit a photon corresponding to the largest wavelength of the Balmer series. The K.E. of colliding electron will be


Correct
  • 1:
    10.2 eV
  • 2:
    1.9 eV
  • 3:
    12.1 eV
  • 4:
    13.6 eV
11:

Photo electric effect supports the quantum nature of light because:


Correct
  • 1:
    there is a minimum frequency of light below which no photo electrons are emitted.
  • 2:
    the maximum K.E. of photoelectrons depends only on the frequency of light and not on its intensity.
  • 3:
    even when the metal surface is faintly illuminated by light of the approximate wavelength, the photo electrons leave the surface immediately.
  • 4:
    electric charge of photoelectrons is quantized.
12:

If the electron in the hydrogen atoms is excited to n = 5 state, the number of frequencies present in the radiation emitted is :


Correct
  • 1:
    4
  • 2:
    5
  • 3:
    8
  • 4:
    10
13:

The ratio of magnetic dipole moment of an electron of charge e and mass m in the Bohr orbit in hydrogen to the angular momentum of the electron in the orbit is:


Correct
  • 1:
    e/m
  • 2:
    e/2m
  • 3:
    m/e
  • 4:
    2m/e
14:

If λ1 and λ2 are the wavelengths of characteristic X-ray and gamma rays respectively, then the relation between them is


Correct
  • 1:
    λ1 ≤ λ2
  • 2:
    λ1 = λ2
  • 3:
    λ1 > λ2
  • 4:
    λ1 < λ2
15:

In the nuclear reaction given by 2He4 + 7N14 → 1H1 + X then the nucleus X is :


Correct
  • 1:
    Nitrogen of mass 16
  • 2:
    Nitrogen of mass 17
  • 3:
    Oxygen of mass 16
  • 4:
    Oxygen of mass 17
16:

If 10% of a radioactive material decays in 5 days, then the amount of the original material left after 20 days is approximately:


Correct
  • 1:
    60%
  • 2:
    65%
  • 3:
    70%
  • 4:
    75%

Feature Image

A level Modern Physics and the Atom Quiz 1
gcequiz
Student
Instructor
Account
Contact us

Efoulan, Yaounde
Cameroon, Email:info@gcequiz.com