The petrol fraction is obtained from near the top of the column. The bitumen fraction is obtained from the bottom of the column. Explain how the petrol and bitumen fractions differ in their properties and uses. (6 marks)

Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.