Physics photoelectric effect powerpoint explanation :)

i do not own this as it is a resource from my teacher who took it from someone else and so your the next lovely people i am sending this to you  to aid  all you physicians  reach your potential and that A*.

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  • Created on: 09-01-13 15:11
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THE PHOTOELECTRIC EFFECT
THIS IS THE EMISSION OF ELECTRONS FROM
MATTER WHEN MATTER IS ILLUMINATED BY
CERTAIN TYPES OF ELECTROMAGNETIC
RADIATION.
IT WAS FIRST OBSERVED BY HEINRICH HERTZ IN 1887
THE EFFECT OCCURS WHEN METALS ARE
ILLUMINATED BY UV LIGHT AND CAN OCCUR WITH THE
ALKALI METALS FOR VISIBLE LIGHT.
©
John Parkinson…read more

Slide 3

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The electromagnetic radiation releases electrons
from the metal cathode. These electrons are
attracted to the anode and complete a circuit
allowing a current to flow
Radiation
Anode +ve vacuum Cathode -ve
electrons
m
A
©
John Parkinson…read more

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If the polarity is reversed, the pd across the tube
can be increased until even the most energetic
electrons fail to cross the tube to A. The
milliammeter then reads zero.
Radiation
A C
electrons
V
m
A
The p.d. across the tube measures the
maximum kinetic energy of the ejected
electrons in electron volts.
©
John Parkinson…read more

Slide 5

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At the end of the nineteenth century, Classical
Electromagnetic Wave Theory thought of light
waves as being like water waves.
A
The wave's Intensity or energy was directly
proportional to the square of the Amplitude, A.
©
John Parkinson…read more

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Potassium metal undergoes photoemission with
blue and green light, but not with red light.
Blue light
Emission!
Emission!
Green
light
Red light
Nothin
g!!
potassium metal
©
John Parkinson…read more

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Comments

william

best photoelectric explanation I have come across

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