Physics
2020 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE PH 2020 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 46–48 of 65. Imported answers require review unless explicitly marked reviewed.
Question 36
Open questionPHMCQ2 marksNeeds review
According to the Fermi gas model of the nucleus, the nucleons move in a spherical volume of radius
, where
is the mass number and
is an empirical constant with the dimensions of length. The Fermi energy of the nucleus
is proportional toYour answerChoose one option.
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Consider a two dimensional crystal with 3 atoms in the basis. The number of allowed optical branches (
) and acoustic branches (
) due to the lattice vibrations areYour answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 38
Open questionPHMCQ2 marksNeeds review
The internal energy
of a system is given by
, where
is a constant of appropriate dimensions;
and
denote the volume and entropy, respectively. Which of the following gives the correct equation of state of the system?Your answerChoose one option.
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