Question

What is uncertainty principal and give an example?

Answer 1

Uncertainty principle:

1. Heinsberg's uncertainty principle or uncertainty principle is an important theory in quantum physics.
2. The uncertainty principle states that it is impossible to determine the velocity and the position of the subatomic particles at the same time.
3. The formula for the uncertainty principle is $∆x∆p\ge \frac{h}{4\mathrm{\pi }}$.

Where, $∆x$ is uncertainty position, $∆p$ is uncertainty of momentum and $h$ is Planck's constant.

Application of the uncertainty principle:

1. The speed and the location of a moving car can be determined at the same time with minimum error.
2. But in the microscopic particles, it is not possible to measure the momentum/velocity and the position of the particle simultaneously.
3. Using this uncertainty principle one can calculate the minimum average kinetic energy of an electron if it is confined in an atom of radius $1A^o$.
4. Moreover, this principle helps us understand finite width of a spectral line and non-existence of electron inside a nucleus.