Question

Assertion :In an atom, the velocity of electrons in the higher orbits keeps on decreasing. Reason: Velocity of electron in an orbit is inversely proportional to the radius of the orbit.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

$Velocity=\sqrt{\frac{Z{k}_e{e}^2}{m_{e}r}}$

$V\propto \frac{1}{\sqrt{r}}$

As the radius increases velocity decreases.

Velocity square of an electron is inversely proportional to the radius of the orbit.

Hence option A is correct.