Podcast
Questions and Answers
What is the speed of light in meters per second?
What is the speed of light in meters per second?
- 3 x 10^6 m/s
- 30,000,000 m/s
- 3 x 10^9 m/s
- 300,000,000 m/s (correct)
In which medium does light travel the fastest?
In which medium does light travel the fastest?
- Solid
- Liquid
- Air
- Vacuum (correct)
What is the relationship between amplitude and brightness in light waves?
What is the relationship between amplitude and brightness in light waves?
- Higher amplitude corresponds to higher brightness. (correct)
- Higher amplitude results in lower energy.
- No correlation exists between amplitude and brightness.
- Higher amplitude leads to dimmer light.
Which medium has the slowest speed for light to travel?
Which medium has the slowest speed for light to travel?
What does a brighter light wave indicate about its amplitude?
What does a brighter light wave indicate about its amplitude?
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?
What happens to light speed as the medium becomes denser?
What happens to light speed as the medium becomes denser?
Which statement about the amplitude of light waves is true?
Which statement about the amplitude of light waves is true?
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?
Which of the following is NOT true about light waves?
Which of the following is NOT true about light waves?
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?
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?
In which scenario would you observe light traveling the fastest?
In which scenario would you observe light traveling the fastest?
Why does light slow down in denser materials?
Why does light slow down in denser materials?
How does brightness vary with respect to amplitude?
How does brightness vary with respect to amplitude?
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?
Which of the following statements about light amplitude is correct?
Which of the following statements about light amplitude is correct?
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?
What characteristic defines the relationship between amplitude and energy in light waves?
What characteristic defines the relationship between amplitude and energy in light waves?
Which statement correctly describes the transition of light speed through different materials?
Which statement correctly describes the transition of light speed through different materials?
Flashcards
Speed of EM waves
Speed of EM waves
300,000,000 m/s (or 3 x 10⁸ m/s)
Brightness of light
Brightness of light
Related to the amplitude of the light wave.
Amplitude of light wave
Amplitude of light wave
A measurement of the height of light waves; determines brightness.
Light speed in different media
Light speed in different media
Light travels slower in denser substances.
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Vacuum vs Air speed
Vacuum vs Air speed
Light travels faster in vacuum.
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Light in air
Light in air
Light travels slightly slower in air than in a vacuum.
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Light in liquids
Light in liquids
Light travels slower in liquids.
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Light in solids
Light in solids
Light travels slowest in solids due to their denseness.
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Exponential form
Exponential form
A way to write very large or very small numbers using powers of 10.
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Waste audit
Waste audit
A systematic examination of waste produced by an organization or environment.
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What is the speed of light in a vacuum?
What is the speed of light in a vacuum?
The speed of light in a vacuum is approximately 299,792,458 meters per second. This is often rounded to 3 x 10⁸ m/s.
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How does light travel through different materials?
How does light travel through different materials?
Light travels slower in denser materials. It slows down when it moves from a less dense medium like air to a denser medium like water or glass.
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What does the amplitude of a light wave determine?
What does the amplitude of a light wave determine?
The amplitude of a light wave determines its brightness or intensity. A higher amplitude means a brighter light and vice versa.
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What is the relationship between brightness and energy?
What is the relationship between brightness and energy?
A brighter light carries more energy than a dimmer light because it has a higher amplitude.
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How does the speed of light relate to the medium?
How does the speed of light relate to the medium?
Light travels at its fastest in a vacuum. It slows down when traveling through air, water, and solids because of their density.
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What is an exponential form?
What is an exponential form?
Exponential form is a concise way to represent very large or very small numbers. It uses a base number (often 10) raised to a power (exponent).
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What is a waste audit?
What is a waste audit?
A systematic examination of the waste produced by a school or other organization to determine how much waste is being generated and what types of materials are being discarded.
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What is the goal of a waste audit?
What is the goal of a waste audit?
The goal of a waste audit is to identify areas where waste generation can be reduced and recycling efforts can be improved.
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What is the difference between a waste audit and a regular trash collection?
What is the difference between a waste audit and a regular trash collection?
A waste audit is a focused examination of waste, analyzing its composition and origin. Regular trash collection is simply the process of removing garbage.
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Why is a waste audit important?
Why is a waste audit important?
Waste audits are important because they provide valuable information for developing sustainable practices and making informed decisions about waste management.
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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
- 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
- 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
- Objectives:
- Identifying waste issues in the school
- Conduct a waste audit of the school environment
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