If the deBroglie wavelength of an electron is equal to `10^(-3)` times the wavelength of a photon of frequency `6xx10^(-14)Hz` then the speed (in m/s) of electron is equal to:
(Speed of light `=3xx10^(8)m//s)`
Planck's constant `=6.63xx10^(-34)J.s`
Mass of electron `=9.1xx10^(-31)kg)`

Explanation

To solve the problem, we need to find the speed of the electron given that its de Broglie wavelength is equal to \(10^{-3}\) times the wavelength of a photon with a frequency of \(6 \times 10^{-14} \text{ Hz}\).

### Step-by-Step Solution:

1. **Determine the Wavelength of the Photon:**
The wavelength (\(\lambda\)) of a photon can be calculated using the formula:
\[
\lambda = \frac{c}{f}
...