Photon energy and momentum

Problem Statement

Light possesses particle-like properties, and each particle is called a photon. The energy $E$E and momentum $p$p of a single photon corresponding to light with wavelength $\lambda$λ are expressed, using Planck's constant $h$h, as follows:

$$E = \frac{hc}{\lambda}$$E=λhc​ $$p = \frac{h}{\lambda}$$p=λh​

Here, $c$c is the speed of light in a vacuum.

Monochromatic light with wavelength $\lambda$λ is emitted from a light source. Find the ratio $\frac{E}{p}$pE​ of the energy $E$E and momentum $p$p of a single photon corresponding to this light.

Constraints

• $c = 3.0 \times 10^8 \ \text{m/s}$c=3.0×108 m/s
• $h = 6.6 \times 10^{-34} \ \text{J}\cdot\text{s}$h=6.6×10−34 J⋅s
• $\lambda = 6.0 \times 10^{-7} \ \text{m}$λ=6.0×10−7 m

Input Format

Enter the value of the calculated ratio $\frac{E}{p}$pE​ expressed in $\text{m/s}$m/s units.