h( V – Vo) = ½ meV 2
Experimental results observed for the experiment of Photoelectric effect-
o When beam of light falls on a metal surface electrons are ejected immediately.
o Number of electrons ejected is proportional to intensity or brightness of light
o Threshold frequency( vo): For each metal there is a characteristic minimum frequency below which photoelectric effect is not observed. This is called threshold frequency.
o If frequency of light is less than the threshold frequency there is no ejection of electrons no matter how long it falls on surface or how high is its intensity.
Photoelectric work function( Wo): The minimum energy required to eject electrons is called photoelectric work function. Wo = hvo
h( V – Vo) = ½ meV 2
Energy of the ejected electrons:
Dual behavior of electromagnetic radiation- The light possesses both particle and wave like properties, i. e., light has dual behavior. whenever radiation interacts with matter, it displays particle like properties.( Black body radiation and photoelectric effect) Wave like properties are exhibited when it propagates( interference an diffraction)
When a white light is passed through a prism, it splits into a series of coloured bands known as spectrum.
Spectrum is of two types: continuous and line spectrum
a. The spectrum which consists of all the wavelengths is called continuous spectrum.