El arco iris es un fenómeno que se produce principalmente por: I. refracción de la luz
II. reflexión total interna de la luz
III. Interferencia luminosa
a) sólo I
b) sólo II
c) sólo III
d) sólo I y II

tbh i dont know ether

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is