Recognize the visible part of the electromagnetic spectrum and the relationship between wavelength, frequency, and energy.

The region associated with electromagnetic spectrum  which contains  light at frequencies and wavelengths that stimulates the rod and cones in the human eye is recognized as the visible region of the electromagnetic spectrum. The eye makes  the association  with some selected portions of that visible region through color.

Energy is inversely proportional to wavelength and it is directly proportional to the frequency.As the frequency and wavelength are related by a constant (c) we can also write the energy in terms of wavelength by the equation  .

where h is a Planck's constant,

c is the velocity of the light.

the answer is a! (2.9 x 10^-18 j) hope i could someone. : )