Question

Newton's laws of classical mechanics are replaced in quantum mechanics by.....

• A. Snell's Law
• B. Schrödinger's equations
• C. Maxwell's equations
• D. Laplace equation

Hint:

Newton → Classical motion; Schrödinger → Quantum motion (wavefunctions, probabilities).

Answer 1

The Correct Option is B

Step 1: Classical vs quantum mechanics.
- Newton’s laws describe motion of macroscopic objects.
- At atomic scale, particles show wave–particle duality, making Newton’s framework invalid.
Step 2: Quantum framework.
The time-dependent Schrödinger equation: \[ i \hbar \frac{\partial \Psi}{\partial t} = \hat{H} \Psi \] describes how the wavefunction \(\Psi\) evolves in time.
Step 3: Conclusion.
Thus, Newton’s laws are replaced in quantum mechanics by Schrödinger’s equations.
Final Answer: \[ \boxed{\text{Schrödinger's equations}} \]