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SCH4U1 - Photoelectric Effect Questions And Answers 100% Graded A+
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Student Exploration: Photoelectric Effect Directions: Follow the instructions to go through the simulation. Respond to the questions and prompts in the orange boxes. Vocabulary: electron volt, frequency, photoelectric effect, photon, photon flux, voltage, wavelength, work function Prior Knowle...

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  • June 18, 2022
  • 7
  • 2021/2022
  • Exam (elaborations)
  • Questions & answers

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  • sch 4u1
  • sch4u1 photoelectric effect questions and answers 100 graded a
  • 1 suppose you went bowling
  • but instead of a bowling ball you rolled a ping pong ball down the alley what do you think woul

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Student Exploration: Photoelectric Effect
Directions: Follow the instructions to go through the simulation. Respond to the
questions and prompts in the orange boxes.

Vocabulary: electron volt, frequency, photoelectric effect, photon, photon flux, 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?

Ping pong ball would most likely miss the bowling pins or not be able to knock them down.


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.

There would be more of a chance for the ping pong balls to hit the bowling pins, but they
wouldn’t get knocked down.

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 Photon flux is 5 γ/ms, the
Voltage is 0.0 volts, and Potassium is selected. Click
Flash the light to send photons of light (green arrows)
toward 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?

When the photons hit the electrons, a few are ejected from the potassium metal.


2. What happens when the electrons reach the light bulb?

The lightbulb lights up momentarily when the electrons hit it.


When electrons reach the light bulb they complete a circuit, causing the bulb to glow briefly.




This study source was downloaded by 100000842568006 from CourseHero.com on 06-18-2022 00:15:02 GMT -05:00


https://www.coursehero.com/file/106647635/SCH4U1-Photoelectric-Effectdocxpdf/

, Activity A: Get the Gizmo ready:

Wavelength and ● Check that the Voltage is 0.0 volts and Potassium
flux is selected.


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: What factors affect the ability of light to free electrons from a metal surface?

1. Observe: Click Flash the light with a variety of wavelength values. What do you notice?

I noticed that wavelengths below 530nm would not eject electrons. Smaller wavelengths
ejected electrons and the ejected electrons moved much faster than those hit with bigger
wavelengths.

2. Observe: The photon flux is a measure of how bright the light is. It is equal to the number
of photons that are released in a given time. It is given as photons (γ) per millisecond (ms).

Click Flash the light with a variety of Photon flux values. What do you notice?

The higher the photon flux value, the more electrons were ejected. The more electrons
ejected the brighter the lightbulb. A lower photon flux value meant that less electrons were
ejected and the lightbulb was much dimmer.

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? Photon flux


Explain: Photon flux is equal to the number of photons released at a certain time. It
will determine how many photons strike the metal.


B. Which factor determines how much energy each photon has? Wavelength


Explain: A shorter wavelength ejects more electrons and a longer wavelength ejects
less electrons. This is because the shorter the wavelength, the higher the
frequency of the wave, which means more energy.




This study source was downloaded by 100000842568006 from CourseHero.com on 06-18-2022 00:15:02 GMT -05:00


https://www.coursehero.com/file/106647635/SCH4U1-Photoelectric-Effectdocxpdf/

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