Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET
Exam
NEET
Subject
Physics
Chapter
Atomic Physics

NEET · Physics · Atomic Physics

Read the following statements: (A) Volume of the nucleus is...

Read the following statements:
(A) Volume of the nucleus is directly proportional to the mass number.
(B) Volume of the nucleus is independent of mass number.
(C) Density of the nucleus is directly proportional to the mass number.
(D) Density of the nucleus is directly proportional to the cube root of the mass number.
(E) Density of the nucleus is independent of the mass number.

Choose the correct option from the following options.

Options

  1. A(A) and (D) only.
  2. B(A) and (E) only.
  3. C(B) and (E) only.
  4. D(A) and (C) only

Correct answer

B. (A) and (E) only.

Step-by-step solution

Radius of nucleus is R=R0A13R = {R}_{0}A\dfrac{1}{3}, where, R0=1.2×10−15m{R}_{0} = 1 . 2 \times {10}^{- 15}m and A is mass number of nucleus.

Thus, R∝A13R ∝ A\dfrac{1}{3}

Volume of nucleus is V=43πR3⇒V∝R3⇒V∝AV = \dfrac{4}{3}\pi{R}^{3} ⇒ V ∝ {R}^{3} ⇒ V ∝ A.

Now, the density of nucleus is given by ρ=MV=mA43πR03A=m43πR03ρ = \dfrac{M}{V} = \dfrac{mA}{\dfrac{4}{3}\pi{R}_{0}^{3}A} = \dfrac{m}{\dfrac{4}{3}\pi{R}_{0}^{3}}

Thus, density is independent of AA.

Hence, only \left(A\right)and(E)and \left(E\right) are correct.

Practice Atomic Physics on Quantrex Academy →

More from Atomic Physics

The energy levels of certain atom are represented in the following figure. During the… MHT CET Medical 2026The ratio of ionization energy of a hydrogen atom in fifth excited state to second… MHT CET Medical 2026The wavelength of radiation emitted is ' λ ' when an electron jumps from second to first… MHT CET Medical 2026The angular momentum of an electron in Bohr's hydrogen atom having energy -0.544 eV is (h… MHT CET Medical 2026An electron of mass ' m_e ' and charge ' e ' revolving around the nucleus in n^ th orbit… MHT CET Medical 2026The ratio of angular frequency (ω ) of an electron to the total energy ( E) of an… MHT CET Medical 2026The ratio between the areas of Bohr's first three orbits of the hydrogen atom are MHT CET Medical 2026A hydrogen atom in its ground state is irradiated by light of wavelength 1026\ Å . The… MHT CET Medical 2026 Full Atomic Physics list All NEET PYQs