Podcast
Questions and Answers
What is the speed of light in meters per second?
What is the speed of light in meters per second?
In which medium does light travel the fastest?
In which medium does light travel the fastest?
What is the relationship between amplitude and brightness in light waves?
What is the relationship between amplitude and brightness in light waves?
Which medium has the slowest speed for light to travel?
Which medium has the slowest speed for light to travel?
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What does a brighter light wave indicate about its amplitude?
What does a brighter light wave indicate about its amplitude?
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How does the speed of light in air compare to that in liquid?
How does the speed of light in air compare to that in liquid?
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What happens to light speed as the medium becomes denser?
What happens to light speed as the medium becomes denser?
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Which statement about the amplitude of light waves is true?
Which statement about the amplitude of light waves is true?
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When comparing light propagation, which order reflects the correct speeds from fastest to slowest?
When comparing light propagation, which order reflects the correct speeds from fastest to slowest?
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Which of the following is NOT true about light waves?
Which of the following is NOT true about light waves?
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What happens to the speed of light as it transitions from a vacuum to a solid?
What happens to the speed of light as it transitions from a vacuum to a solid?
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If the amplitude of a light wave is increased, what happens to its energy?
If the amplitude of a light wave is increased, what happens to its energy?
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In which scenario would you observe light traveling the fastest?
In which scenario would you observe light traveling the fastest?
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Why does light slow down in denser materials?
Why does light slow down in denser materials?
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How does brightness vary with respect to amplitude?
How does brightness vary with respect to amplitude?
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What is the order of light speed from fastest to slowest across different media?
What is the order of light speed from fastest to slowest across different media?
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Which of the following statements about light amplitude is correct?
Which of the following statements about light amplitude is correct?
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What can be concluded about the brightness of a dim light compared to a bright light?
What can be concluded about the brightness of a dim light compared to a bright light?
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What characteristic defines the relationship between amplitude and energy in light waves?
What characteristic defines the relationship between amplitude and energy in light waves?
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Which statement correctly describes the transition of light speed through different materials?
Which statement correctly describes the transition of light speed through different materials?
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Study Notes
Waves and their applications
- Unit 1 - Module L, Lesson 3: Light Wave
- Light wave is a type of electromagnetic (EM) wave.
Day 1: Characteristics of EM waves
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Objectives:
- Identify speed of EM wave
- Explain relationship between brightness and amplitude
- Compare speed of light traveling in different materials
Starter
- Read page 45
- Answer question posted on Google Classroom
- Diagram shows different types of EM waves (Gamma Ray, X-ray, Ultraviolet, Visible, Infrared, Radio). And their altitude from sea level
Page 45
- Not all wavelengths of light pass through the atmosphere equally.
- Most of visible light and radio frequencies pass through the atmosphere.
- Atmosphere blocks most higher-frequency EM waves (e.g., ultraviolet (UV) light)
- Small amounts of UV light are good for the body; skin cells produce Vitamin D
- Vitamin D helps intestines absorb calcium
- Calcium strengthens teeth and bones
- Too much UV light causes sunburn, wrinkles, eye damage, or skin cancer
- Protect from UV light using sunscreen (high SPF) or protective clothing.
Speed of Light
- In a vacuum, all EM waves, including light, move at 300,000,000 m/s.
- This is a constant called the speed of light.
- EM waves travel more slowly through materials than in a vacuum.
Checking understanding
- Speed of light = 300,000,000 m/s or 3 x 108 m/s
Light travels more slowly in denser media
- Speed of light is faster in a vacuum, then in air, then in liquid, then in solid.
- Light travels slower in denser (or thicker) materials.
Checking understanding: page 58
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Question 4: Study the diagram, which statements are true?
- Light travels the fastest in a vacuum compared to other mediums.
- Light travels slower in mediums than in a vacuum.
Characteristics of Light Waves
- Intensity (brightness) = amplitude
- High amplitude = High energy = Brighter light
- Large amplitude means a lot of energy (very hot)
- Small amplitude means less energy (warm)
Brightness and Amplitude
- Amplitude of a light wave corresponds to brightness (intensity) of the light.
- Brighter light carries more energy than a dimmer light.
- Brightness increases with the amplitude of the light wave.
Checking understanding: Page 58
- Observe the photos
- Main difference is wavelength/brightness/frequency of the light
- Brightness/amplitude of the brighter light is greater than the dimmer light.
- Brighter light has more energy than dimmer light.
Exit Ticket: Pop Questions
- Answer pop questions on Google Classroom.
- This is the exit ticket for the lesson.
Day 2 - MAP test
- MAP test scheduled for Day 2
Day 3 - Lesson self-check
- Answer pages 38-39, 46 (Q. 7), 48 (Q. 10, Q. 11), 50 (Q. 14), 52 (Q. 1), 58-59.
Day 4 - Project
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Objectives:
- Identifying waste issues in the school
- Conduct a waste audit of the school environment
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Description
Explore the fascinating world of electromagnetic waves with a focus on light waves. This quiz covers their characteristics, speed, and the impact of different materials on light propagation. Delve into the relationship between brightness and amplitude as you test your understanding of this essential topic in physics.
