16 Questions
Which type of wire has less bandwidth and suffers greater signal loss and interference?
Copper wire
What is the purpose of directing x-rays towards cancer cells?
To kill the cells
What is the term for the area where a base station for a mobile phone network is located?
Cell
How do optic fibres transmit pulses of light?
Using the principle of total internal reflection
What is the difference between radio waves and gamma rays in terms of frequency?
Radio waves have a lower frequency than gamma rays
What type of wave is light an example of?
Transverse wave
What are the primary colours of light?
Red, blue, and green
What happens when white light passes through a red filter?
Red light comes out the other side
What is the primary reason why optic fibres are preferred over copper wires for signal transmission?
Optic fibres have a higher bandwidth and suffer less signal loss and interference
What is the purpose of using infrared cameras?
To capture images in low-light conditions
What is the principle behind creating an image using X-rays?
X-rays cannot pass through bones and teeth
What is the common characteristic of all electromagnetic waves?
They all travel at the same speed
What is the relationship between the frequency and wavelength of X-rays and microwaves?
X-rays have a shorter wavelength and higher frequency than microwaves
How do primary colours of light combine to produce other colours?
Primary colours can be combined to produce any colour of light
What is the result of mixing secondary colours of light?
Produces white light
What is the purpose of using a red filter when passing white light through it?
To block all colours of light except red
Study Notes
Communication Systems
- Copper wire has limitations, including lower bandwidth and greater signal loss and interference compared to optic fibre.
- Optic fibres transmit pulses of light using the principle of total internal reflection.
X-rays
- X-rays are a form of high-energy electromagnetic radiation.
- X-rays can be created by directing a beam onto a target, creating an image because they cannot pass through bones and teeth.
- X-rays are used in radiotherapy to kill cancer cells, CT scanning, luggage scanning, and to find flaws in metal.
Mobile Phone Networks
- The area in which a base station is located is called a cell.
- Each base station cell has a unique frequency for transmitting mobile phone signals.
Waves
- In longitudinal waves, particles move in the same direction as the wave (e.g., sound).
- In transverse waves, particles move up and down at right angles to the direction of the wave (e.g., light).
- Light travels in a transverse wave.
Electromagnetic Waves
- All electromagnetic waves travel at the same speed (the speed of light).
- Radio waves have the lowest frequency, while gamma rays have the highest frequency.
- X-ray waves have the shortest wavelength compared to microwaves, while radio waves have longer wavelengths compared to red light waves.
Light Colours
- The primary colours of light are red, blue, and green, which can be combined to form all the colours of light.
- The secondary colours of light are magenta, cyan, and yellow, produced when two primary colours are mixed.
- White is produced when primary colours are mixed or when secondary colours are mixed.
Light Filters
- When white light passes through a red filter, only red light is transmitted, while other colours are absorbed.
Applications of Electromagnetic Waves
- Ultraviolet radiation is used to kill bacteria in air-conditioning systems.
- Gamma rays are used to destroy cancer cells.
- Radio waves are used to listen to music.
- Infrared rays are used to remote control devices.
Infrared Cameras
- Infrared cameras can be used at night.
Communication Systems
- Copper wire has limitations, including lower bandwidth and greater signal loss and interference compared to optic fibre.
- Optic fibres transmit pulses of light using the principle of total internal reflection.
X-rays
- X-rays are a form of high-energy electromagnetic radiation.
- X-rays can be created by directing a beam onto a target, creating an image because they cannot pass through bones and teeth.
- X-rays are used in radiotherapy to kill cancer cells, CT scanning, luggage scanning, and to find flaws in metal.
Mobile Phone Networks
- The area in which a base station is located is called a cell.
- Each base station cell has a unique frequency for transmitting mobile phone signals.
Waves
- In longitudinal waves, particles move in the same direction as the wave (e.g., sound).
- In transverse waves, particles move up and down at right angles to the direction of the wave (e.g., light).
- Light travels in a transverse wave.
Electromagnetic Waves
- All electromagnetic waves travel at the same speed (the speed of light).
- Radio waves have the lowest frequency, while gamma rays have the highest frequency.
- X-ray waves have the shortest wavelength compared to microwaves, while radio waves have longer wavelengths compared to red light waves.
Light Colours
- The primary colours of light are red, blue, and green, which can be combined to form all the colours of light.
- The secondary colours of light are magenta, cyan, and yellow, produced when two primary colours are mixed.
- White is produced when primary colours are mixed or when secondary colours are mixed.
Light Filters
- When white light passes through a red filter, only red light is transmitted, while other colours are absorbed.
Applications of Electromagnetic Waves
- Ultraviolet radiation is used to kill bacteria in air-conditioning systems.
- Gamma rays are used to destroy cancer cells.
- Radio waves are used to listen to music.
- Infrared rays are used to remote control devices.
Infrared Cameras
- Infrared cameras can be used at night.
This quiz covers various aspects of electromagnetic radiation, including copper wire, infrared cameras, X-rays, and their applications in different fields.
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