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Key WordsKey Words:•Radiation

•Ultraviolet

•Visible Light

Topic 2Topic 2:: The Electromagnetic The Electromagnetic SpectrumSpectrum

20 April 202320 April 2023

Beyond the Beyond the VisibleVisible

Lesson Objective:Lesson Objective:To understand how infrared and ultraviolet radiation was discoveredStarterStarter:

Why are the pictures associated with the key wordsExtension: why is radiation dangerous?

Why are these pictures associated with the key words

Radiation• • • •

Ultraviolet • • • •

Visible Light• • • •

Extension: Explain in your own words why radiation is dangerous

Lesson OutcomesLesson Outcomes::1.Recall how infrared and ultraviolet radiation was discovered (Grade D-EGrade D-E)

2.Explain how infrared and ultraviolet radiation was discovered (Grade B-CGrade B-C)

3.Apply the discovery of infrared and ultraviolet to an exam question (Grade A-Grade A-A*A*)

Key WordsKey Words: Radiation, Ultraviolet, Visible Light

Lesson Objective:Lesson Objective: To understand how infrared and ultraviolet radiation was discovered



1.Watch the video

2.Read the questions in front of you

3.Watch it again and answer the questions

4.Compare your answers with the person sitting next to you

http://www.youtube.com/watch?v=XPrVeks2OHI



1. What is the source of life on Earth?

2. Where does light come from?

3. What speed does it travel at?

4. What is the Sun?

5. Who was Sir Frederick William Hershel?

6. What did he do?

7. What did he notice?

8. Was there an increase or decrease in temperature?

9. What did he decide to do?

10.What did he discover?

11.What is this type of light called?



Helpful words:• Light• Water• Stars• 300 000km• Astronomer• Uranus• Jupiter• Pluto• Spectrum• Temperature • Colour• Violet • Red • Visible• Infrared• Ultraviolet

After learning about William Herschel's discovery of infrared light, which he found beyond the visible red portion of the spectrum in 1800, Johann Ritter began to conduct experiments to see if he could detect invisible light beyond the violet portion of the spectrum as well. In 1801, he was experimenting with silver chloride, which turned black when exposed to light. He had heard that blue light caused a greater reaction in silver chloride than red light did. Ritter decided to measure the rate at which silver chloride reacted to the different colours of light. He directed sunlight through a glass prism to create a spectrum (the rainbow created when light is divided into its colours). He then placed silver chloride in each colour of the spectrum and found that it showed little change in the red part of the spectrum, but darkened toward the violet end of the spectrum. Johann Ritter then decided to place silver chloride in the area just beyond the violet end of the spectrum, in a region where no sunlight was visible. To his amazement, this region showed the most intense reaction of all. This showed for the first time that an invisible form of light existed beyond the violet end of the visible spectrum.

Q1. What did Ritter want to do?

Q2. What did he do?

Q3. What did he find out?

Q4. What did he discover after the violet end of the spectrum?

Q5. What name was given to this form of light?

1.Using the information you have found out today construct a paragraph on ‘the discovery of infrared and ultraviolet’

2.Talk Like a Scientist

3.Peer assess it using the level ladder and suggest one improvement that can be made to it.



Grade

Criteria Tick

D-E Know who discovered the two types of radiation.

B-C Explain how the two types of radiation were discovered and what types of experiments were carried out.

A-A* Explain clearly and comprehensively the difference between the difference between the discovery of the two types of radiation. Include your knowledge of what they are used for today.

Keyword Tick

Hershel

Prism Ritter

Ritter

Silver chloride

Spectrum

Prism

Temperature

Thermometer



Sentence Starters:

William Hershel...

He discovered .......................................................

Afterwards Ritter decided to...............................

As a result of it he found ...............

The difference between....................





3.Apply the discovery of infrared and ultraviolet to an exam question (Grade A-Grade A-A*A*)



PlenaryPlenary1.Answer the exam question using what you have learnt today (5 mins)

2.Peer assess it and give them a mark (2 mins)



Done Lina Amirath Mohamed Mahesh Direnc Hazal Faiza Guled Diana Glody Ladan Gul Muna Maxwell Cansu...

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