Which phenomenon occurs when light bends around the edges of an obstacle or aperture?

What is the SI unit of frequency?

What is the process by which a solid changes directly into a gas without passing through the liquid phase?

Which law of thermodynamics states that heat naturally flows from a hotter body to a cooler body?

What type of lens is thicker at the centre than at the edges?

Which law of thermodynamics states that energy cannot be created or destroyed only converted from one form to another?

Which colour of visible light has the longest wavelength?

What is the unit of power in the SI system?

Which colour of visible light has the shortest wavelength?

Which property of a body is measured by the amount of matter it contains?

What is the formula for kinetic energy?