Question

Which of the following statement is incorrect ?

• A. Conservation laws have deep connection with symmetries of nature
• B. Weak nuclear force is weakest among all fundamental forces of nature
• C. A conservation law is a hypothesis based oil observations and experiments
• D. In a nuclear process mass gets converted to energy or vice versa

Answer 1

Answer: (B)

According to question we have to find incorrect option but
Option (a) According to Noether's theorem, law of conservation of energy is associated with symmetry of nature.
As a result of which, the amount of conserved quantity of any isolated system doesn't change, until some in flow/out flow of physical quantities takes place.
Hence, option (a) is the correct.
Option (b) As we know that, the strength of fundamental force i.e. in order of
(i) strong nuclear force $=1$
(ii) electromagnetic force $=\frac{1}{137}$
(iii) weak nuclear force $=10^{-6}$
(iv) gravity $=6 \times 10^{-39}$
$\therefore$ Strong nuclear force and electromagnetic force $>$ weak nuclear force $>$ gravitational force.
Hence, option (b) is the incorrect.
Option (c) As we know that, the law of conservation of mass, momentum, energy etc. can only be easily observed by experimental observations.
Hence, option (c) is the correct.
Option (d) Since there are two types of nuclear reaction i.e. nuclear fission fusion and in both cases we find generation of energy due to breaking of heavy nuclei $\left(U_{235}\right)$ or by fusion of two light nuclei i.e. $\left(H_1^2\right.$ and $\left.H_1^3\right)$, respectively.