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Remember - Heat, light and sound
EduBook Organización
- 2442 visitas
Heat, light and sound are all around us. We can feel heat from the Sun in the summer and from a radiator in the winter. We need light to see people and objects. We get light from the Sun during the day…
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Calculate. The speed of light
EduBook Organización
- 2223 visitas
The Sun's light takes approximately 8 seconds to reach the Earth. How far is the Sun from the Earth? d = km If the average distance from Pluto to the Sun is 5.9 billion kilometres, how long does it…
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Reflection and refraction of light
EduBook Organización
- 2170 visitas
4.1. Bending of light rays The effects of reflection and refraction of light happen because of the linear propagation of light. 4.2. Reflection of light Reflection happens when light rays meet a smooth…
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True/False Light and Sound
EduBook Organización
- 2103 visitas
Answer true or false: Sunlight comes instantly to Earth. All objects emit their own light. The speed of light is faster than the speed of sound. Sound can be spread by a vacuum.
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Check. Light, shadow and penumbra
EduBook Organización
- 2095 visitas
Remember what you have studied in this section and answer the questions: Name two effects that show that light travels in a straight line. Can you demonstrate it now? With a classmate, describe the…
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Check. The nature of light
EduBook Organización
- 2086 visitas
Remember what you have studied in this section and answer the questions: What is light made up of? ➞ Light is made up of... In which substance does light travel at its maximum speed?
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Reflection and refraction of light
EduBook Organización
- 2010 visitas
Objects reflect light When light shines on an object, sometimes it passes through the object and other times it reflects off it. When an object reflects light, we can see it. Mirrors A mirror is a…
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Summaries - Waves. Light and sound
EduBook Organización
- 1900 visitas
1. Waves An oscillatory or vibratory motion takes place around a central position. It produces the same amount of movement on both sides of this position. A wave is the transmission of an oscillatory or…
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Answer. Light, shadow and penumbra
EduBook Organización
- 1761 visitas
Remember what you have studied in this section and answer the questions: What is a light ray? Light gives off energy. Give an example of something that shows this.
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True / False. Properties of light
EduBook Organización
- 1611 visitas
Are these sentences true or false? Light sources produce light. There are natural light sources and artificial light sources. We can convert light from the Sun into electrical energy using solar panels.…