Waves Light is described as an electromagnetic wave. It has wave-like properties, as can be seen from the interference pattern generated when light from a single source passes through a barrier with two slits. The discrete quantum emissions of light are called photons. The particle-like character of light relates to the way in which light appears to behave as discrete bundles of energy during emission and absorption. This means that when light is emitted, the amount of energy can not take all possible numerical values but must take discrete values or quanta of energy.
Electrons behave in a similar way.
The equivalent electromagnetic wave will also produce the interference pattern in the double slit experiment as with light. When the interference experiment is modified so that we try to determine which of the two slits the electron passed through, we can only recognise an electron by any detection mechanism if we detect the entire quantum of energy. As soon as we modify the experiment to determine which slit the 'electron' passed through, the quantum nature of the energy means that we have changed the conditions of the experiment and the interference pattern disappears. Light and electromagnetic waves in general behave like waves during propagation and are emitted or absorbed in quantum units. A central hypothesis in the curved space theory is the equivalence of mass, energy and space curvature.