Done Lina Amirath Mohamed Mahesh Direnc Hazal Faiza Guled Diana Glody Ladan Gul Muna Maxwell Cansu Alfani Anna Brianna Dzhemile Veera b o a r d Teacher: Miss Roy Class9X/Sc3 Room: S3 Alkay Anisa Courtney Najma Nikita Olivia Moesha Mazlum Syntyche Shana
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Teacher: Miss Roy Class9X/Sc3 Room: S3
Alkay Anisa
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Nik
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Oliv
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Maz
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SyntycheShana
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*)
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?
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)
Lesson Objective:Lesson Objective: To understand how infrared and ultraviolet radiation was discovered
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.