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Grade 12 Alternate E-Day Task (Photons and Electrons)

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This task will take you through the topic on electrons and photons. It forms part of your course work as outlined in the IEB SAGS document.

Watch the videos and answer the questions that follow.

This is a timed assignment and must be completed in one sitting.

This task will take you through the topic on electrons and photons. It forms part of your course work as outlined in the IEB SAGS document.

Watch the videos and answer the questions that follow.

This is a timed assignment and must be completed in one sitting.

Electromagnetic Waves
The Photoelectric Effect

The following video demonstrates the Photoelectric effect using visible light and UV Light.

Watch the following video on the basic concepts involved in the photoelectric effect.

Answer the questions according to the time stamps on the video.

Untitled Section
Untitled Section
The Duality of Light: Is a light a wave or is it a particle? Watch the video below and answer the question that follow.
Activity 9.1 in your workbook page 274
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Question 1
00:49
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Obavezno
1
Pitanje 1
1.

Which electromagnetic radiation (EMR) was discovered by placing a thermometer next to the red light?

Question 2
02:00
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Obavezno
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Question 3
02:33
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Obavezno
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Question 4
00:13
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Obavezno
1
Question 5
00:37
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Obavezno
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Question 6
01:17
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Obavezno
2
Question 7
02:06
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Obavezno
1
Question 8
02:27
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Obavezno
1
Question 9
02:32
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Question 10
03:30
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Pitanje 10
10.

Describe the photoelectric effect.

Question 11
04:56
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Pitanje 11
11.

Define threshold frequency (cut-off frequency).

Question 12
06:06
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2

Watch the following video on the basic concepts involved in the photoelectric effect.

Answer the questions according to the time stamps on the video.

You may begin viewing at time: 10:44 (first marker on the video time line)

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1
1
3
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2
1
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1

Watch video until 25:20

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Watch the video to the end.

Question 25
01:26
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Question 26
01:48
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Obavezno
1
Pitanje 26
26.

What other name is give to the "wave packets" of light?

Question 27
02:08
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Obavezno
1
Pitanje 28
28.

Complete Activity 9.1 in your workbook page 274 and upload your answers

Pitanje 2
2.

The greater the frequency of the EMR, the smaller its wave.

Pitanje 3
3.
Drugi mogući odgovor:
Microwaves
Radio waves
Ultraviolet rays
Pitanje 4
4.

What metal is placed on the electroscope?

Pitanje 5
5.

The plate has to be negatively charged.

Pitanje 6
6.

Match the correct observations. Drag the observation to the correct light source.

Stavka koja se može prevućiarrow_right_altOdgovarajuća stavka

gold leave remains in upright position

arrow_right_alt

UV Light

gold leave drops

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visible light from the desk lamp

Pitanje 7
7.

The brightness of the visible light will cause the gold leave to drop.

Pitanje 8
8.

One photon of light releases

Pitanje 9
9.
Pitanje 12
12.

Define work function of a metal.

Pitanje 13
13.

What metal is placed on the electrode?

Pitanje 14
14.

What was the wavelength of the incident waves when the first observed electrons moved away from the cathode? Write down the value(number) only using ? (unit is nm)

Pitanje 15
15.

Use the formula

to determine the frequency in Hz of this incident radiation. write down the value only.

Pitanje 16
16.
Drugi mogući odgovor:
pertains to the photo electron
Energy of photon
Energy required by a metal to release an electron
Pitanje 17
17.

If the frequency of incident radiation is

Hz, calculate the energy carried by one photon of this light ?

Pitanje 18
18.

Explain what is meant by the photoelectric effect.

Pitanje 19
19.

How does an increasing the intensity of light affect the current in the circuit. Assume the light has a frequency greater than the threshold frequency. (increase, decrease, remains unchanged)

Pitanje 20
20.

Are electrons ejected from a metal when the the incident radiation is below the threshold frequency? (yes/No)

Pitanje 21
21.

Which metal is placed on the cathode now?

Pitanje 22
22.

Why does this metal require a greater frequency of incident radiation to cause electrons to be ejected ?

Pitanje 23
23.

What maximum wavelength is required to eject electrons from this metal

Pitanje 24
24.

What does an increase in intensity of incident radiation produce before it strikes the metal?

Pitanje 25
25.

Light is made up of

Pitanje 27
27.

What field of physics did this discovery by Albert Einstein open up?