Dual Nature Short Notes
Dual Nature Short Notes
Dual Nature Short Notes
RADIATION
Photoelectric emission: The emission of electron due to action of light of suitable energy is called
photoelectric emission. The e– emitted are called photoelectrons.
Photoelectric effect: The emission of e– from a metal surface when light of suitable frequency is
incident on it is called photoelectric effect. Alkali metals like Li, Na, K show
photoelectric effect with visible light metal like Zn, Mg, Ca respond to
ultraviolet light.
Einstein Photoelectric Equation: Photoelectric effect was explained using quantum theory by
Einstein.
𝐸 = 𝜙 + 𝐾. 𝐸 In terms of wavelength
1 𝐶 𝐶 1
ℎ = ℎ𝑜 + 2 𝑚𝑣 2 ℎ (𝜆 − 𝜆 ) = 2 𝑚𝑣 2
𝑜
1
ℎ − ℎ𝑜 = 2 𝑚𝑣 2
1 1 1 1
ℎ( − 𝑜 ) = 2 𝑚𝑣 2 ℎ𝑐 (𝜆 − 𝜆 ) = 2 𝑚𝑣 2
𝑜
Dual nature of matter
De-Broglie Hypothesis: According to de broglie a wave is associated with every moving particle. This
wave is called matter wave and its wavelength is known as debroglie
wavelength.
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