de-Broglie wavelength of electrons of kinetic energy E is `lambda.` What will be its value if kinetic energy of electrons is made 4E ?

Explanation

To solve the problem, we need to find the de-Broglie wavelength of electrons when their kinetic energy is increased from \(E\) to \(4E\).

### Step-by-step Solution:

1. **Understanding de-Broglie Wavelength**:
The de-Broglie wavelength (\(\lambda\)) of a particle is given by the formula:
\[
\lambda = \frac{h}{p}
...