PPSC Lecturer of Physics Online Test 30 Past Papers

In laser fusion, the laser light is:

A proton in a large nucleus:

Lawson’s number is 10²⁰ s ·m−³. If the density of deuteron nuclei is 2 × 10²¹ m⁻³ what should the confinement time be to achieve sustained fusion?

The mass of an electron:

The isotopes of an element:

Two protons are separated by 10−16 m. The nuclear (N), electrostatic (E), and gravitational (G) forces between these protons, in order of increasing strength, are:

Volumes of atomic nuclei are proportional to:

Stable nuclei generally:

The binding energy of a nucleus is the energy that must be supplied to:

The half-life of a radioactive substance is:

The smallest particle of any chemical element that can exist by itself and yet retain the qualities that distinguish it as that element is:

Of the following, which has the smallest rest energy?

The atomic number of an element is:

Which of the following particles is stable?

Compared to fusion in a tokamak, laser fusion makes use of:

Iron has atomic number 26. Naturally mined iron contains isotopes of mass numbers 54, 56, 57, and 58. Which of the following statements is FALSE?

The greatest binding energy per nucleon occurs for nuclides with masses near that of:

Tokamaks confine deuteron plasmas using:

Bromine, with atomic mass 79.942 u, is composed of nearly equal amounts of two isotopes, one of which contains 79 nucleons per atom. The mass number of the other isotope is:

Two protons are about 10⁻¹⁰ m apart. Their relative motion is chiefly determined by:

Most magnetic confinement projects attempt:

Most laser fusion projects attempt:

A nucleus with a mass number of 64 has a mean radius of about:

The mass of an electron:

Let Z denote the atomic number and A denote the mass number of a nucleus. The number of neutrons in this nucleus is: