The wavelengths of yellow and red light are 560 and 780 nm, respectively. What is approximately equal to the ratio of the energy

The wavelengths of yellow and red light are 560 and 780 nm, respectively. What is approximately equal to the ratio of the energy of the yellow light photon to the energy of the red light photon.

Photon energy:

E = hv, where h is Planck’s constant, v is the frequency of light waves.

Frequency can be expressed in terms of wavelength:

v = c / λ, where c is the speed of light, λ is the wavelength.

E = hc / λ.

Photon energies of yellow and red colors:

Ezh = hc / (560 * 10-9 m);

Ezh = hc / (780 * 10-9 m).

The ratio of yellow energy to red photon energy:

Ezh / Ezh = (hc / (560 * 10-9 m)) / (hc / (780 * 10-9 m)) = (780 * 10-9 m) / (560 * 10-9 m) = 1, 4.

Answer: The correct option is B) 1.4.