Kia Dejene Melesa - Gizmos - template Photoelectric Effect
Course
AA 1
Institution
AA 1
Suppose you went bowling, but instead of a bowling ball you rolled a ping pong ball down the alley. What
do you think would happen? No strike would be achieved,since the ping pong ball is not big enough to
knock off any of the pins
2. Suppose you rolled a lot of ping pong balls at the bowling pi...
kia dejene melesa gizmos template photoelectric effect
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GIZMOS
Name: kia dejene Date: ________________________
Student Exploration: Photoelectric Effect
Vocabulary: electron volt, frequency, intensity, photoelectric effect, photon, voltage, wavelength, work function
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. Suppose you went bowling, but instead of a bowling ball you rolled a ping pong ball down the alley. What
do you think would happen? No strike would be achieved,since the ping pong ball is not big enough to
knock off any of the pins
2. Suppose you rolled a lot of ping pong balls at the bowling pins. Do you think that would change the results
of your experiment? Explain. Same event will take place,none of the pins would be knocked,because the
base are small,but knock off a pin the need to generate a lot of momentum and velocity,which can only be
achieved in a vacuum
Gizmo Warm-up
The photoelectric effect occurs when tiny packets of light,
called photons, knock electrons away from a metal surface.
Only photons with enough energy are able to dislodge
electrons.
In the Photoelectric Effect Gizmo™, check that the
Wavelength is 500 nm, the Intensity is 50%, the Voltage is
0.0 volts, and Potassium is selected. Click Flash the light to
send photons of light (green arrows) toward the surface of a
metal plate encased in a vacuum tube.
1. The blue dots on the metal plate are electrons. What
happens when the photons hit the electrons?
As a result they move across the the gradient and head towards the metal plate.
2. What happens when the electrons reach the light bulb?
They turn on bulbs
When electrons reach the light bulb they complete a circuit, causing the bulb to glow briefly.
This study source was downloaded by 100000830772748 from CourseHero.com on 06-18-2022 15:44:22 GMT -05:00
, Activity A: Get the Gizmo ready:
· Check that the Voltage is 0.0 volts.
Wavelength and · Check that Potassium is selected.
intensity
Introduction: Through the centuries, many scientists have debated whether light is a wave or a stream of tiny
particles. In the 1800s, most scientists agreed that phenomena such as refraction and diffraction supported the
light-as-a-wave theory. However, Albert Einstein’s explanation of the photoelectric effect showed that light can act
like a stream of particles as well.
Question: How does the wavelength and intensity of light affect its ability to free electrons from the
surface of a material?
1. Observe: Click Flash the light with a variety of Wavelength values. What do you notice?
__lower wavelength equals higher speeds and increased speed of electron
2. Observe: Click Flash the light with a variety of Intensity values. What do you notice?
That is the controlling factor,it controls number of electron will strike the metal
3. Form hypothesis: Answer the following questions based on what you have observed so far.
A. Which factor determines how many photons will strike the metal? Intensity
Explain: ___the amount of electrons and photons shot at the electrons,correlated with higher intensity
B. Which factor determines how much energy each photon has? _Wavelength___
Explain: ___less wavelength equated to a quicker movement of electron
4. Investigate: Set the Intensity to 10%. Uses the Gizmo to determine the largest wavelength that will
dislodge an electron from the surface of the metal. What is this value? _530nm___
5. Predict: Set the Wavelength to 540 nm. What do you think will happen if you flash the light with an intensity of
10%? What will happen if you flash the light with an intensity of 100%?
At both instance little no effect will happen.
This study source was downloaded by 100000830772748 from CourseHero.com on 06-18-2022 15:44:22 GMT -05:00
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