Physics 2nd Paper MCQ-Barishal Board-2022

1. The phase difference for the destructive interference in Young's double slit experiment will be-

2. The average life of a piece of radionctive element is-

3. What is the value of the equivalent resistance between the point $M$ and $N$ of the figure?

4. What is the difference between valanced band and conduction band for $\mathbf{G e ?}$

5. In order to get zero potential at the centre of the square of the figure what charge at fourth corner is to be placed?