Hertz, in 1887 discovered the phenomena of photoelectric effect for the first time. He was experimenting on the generation of electromagnetic waves by spark discharge and he noticed that sparks around the detector loop were intensified when ultraviolet radiation fell …
Einstein gave an explanation for photoelectric emission based on the Planck’s quantum theory of light. When light of certain frequency (greater than threshold frequency) incidents on a metallic surface the energy on incident photon (hf) is: Partly used to eject …
The experimental arrangement of Millikan’s method to determine Planck’s constant ‘h’ is shown below. The apparatus consists of an evacuated chamber (vaccum) where different alkali metals are placed on a rotating table so that experiment can be performed for different …
Wave optics is the study of wave nature of a light. It can prove by their two phenomena’s of interference and diffraction. Wave front is defined as surface joining the points of same phase. The speed with which the wave …
Thomas Young first demonstrated interference from light waves with a double slit in 1801. The schematic diagram for this experiment is shown in below The single light source is located at S 0, and the light goes through two very narrow openings …
Light is defined in previous article However, a wave is free to oscillate right and left or up and down or at any angle between the vertical and horizontal. Some kinds of crystals have a special property of polarizing light, meaning that they …
Newton’s 1st Law The first law of motion sates that an object will not change its speed or direction unless an unbalanced force (a force which is distant from the reference point) affects it. Another name for the first law …
Electrostatics is a branch of physics that deals with the electric charges at rest electric charges. Since classical physics, it has been known that some materials such as amber attract lightweight particles after rubbing. The Greek word for amber, ήλεκτρον, …
Mr. Andersen explains the difference between potential and kinetic gravitational energy. He also uses physics to calculate the energy in various objects.
Work is energy transferred by force. Energy is the ability to do work. Work and Energy are co related.