Which colour of visible light has the longest wavelength?

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

Which colour of visible light has the shortest wavelength?

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

What is the formula for kinetic energy?

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

What is the formula for gravitational potential energy?

What is the SI unit of frequency?

Which scientist formulated the law of universal gravitation?

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

What is the acceleration due to gravity at the surface of the Earth?