Planck's constant relates the joules of energy absorbed/released by matter to the:
a. atomic number of the element

b. observed wavelength of light

c. speed of light

d. mass of the particulate matter

  B. observed wavelength of light

Explanation:  The relation of Planck's constant relating the Joules of energy absorbed/released by matter is usually used to determine the energy of the photon. The mathematical expression is -

                            E= h c /

Thus as we can observe that the energy is directly proportional to the speed of light and inversely proportional to the wavelength of the light.

Thus , we can say that Planck's constant relates the Joules of energy absorbed/released by matter to the observed wavelength of light.

i think that the answer is c