With what velocity must an electron travel so that its momentum is equal to that of a photon of wavelength 560 nm ?

Explanation

To solve the problem of finding the velocity at which an electron must travel so that its momentum is equal to that of a photon with a wavelength of 560 nm, we can follow these steps:

### Step 1: Understand the relationship between momentum and wavelength
The momentum (P) of a photon can be expressed using the de Broglie wavelength formula:
\[ P = \frac{h}{\lambda} \]
where:
- \( P \) is the momentum,
- \( h \) is Planck's constant (\( 6.63 \times 10^{-34} \, \text{kg m}^2/\text{s} \)),
...