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P6: Quiz 8
P6: Quiz 8
1) This question is all about microwaves.
a) We can use microwaves to cook food. Explain how microwaves cook food in a microwave oven.
b) Microwaves are also used in communication in satellites. What are the differences in frequency and wavelength between a microwave used for communication in satellites and a microwave used to cook food?
c) Explain why the microwaves used to heat up food would not be able to be used in communication with satellites.
d) Explain how microwaves are used in communication to send a message from earth to a satellite and back down to earth.
2)
a) If we have two identical objects that are different temperatures, will the cooler or hotter object emit more infrared radiation?
b) Explain how infrared camera work.
c) Explain how an electric heater uses infrared radiation to heat a room.
d) Can humans see infrared light?
3) Visible light is used in fibre optic cables to transport data across long distances. The diagram below shows what a fibre optic cable looks like.
a) We can use microwaves to cook food. Explain how microwaves cook food in a microwave oven.
b) Microwaves are also used in communication in satellites. What are the differences in frequency and wavelength between a microwave used for communication in satellites and a microwave used to cook food?
c) Explain why the microwaves used to heat up food would not be able to be used in communication with satellites.
d) Explain how microwaves are used in communication to send a message from earth to a satellite and back down to earth.
2)
a) If we have two identical objects that are different temperatures, will the cooler or hotter object emit more infrared radiation?
b) Explain how infrared camera work.
c) Explain how an electric heater uses infrared radiation to heat a room.
d) Can humans see infrared light?
3) Visible light is used in fibre optic cables to transport data across long distances. The diagram below shows what a fibre optic cable looks like.
a) Part of the light ray travelling through the fibre optic cable is shown on the diagram above. Draw the rest of the light ray travelling through the fibre optic cable.
b) A fibre optic cable has a glass centre. What is the name and role for the bit around the glass centre of a fibre optic cable? There is an arrow on the above diagram pointing to the part of the fibre optic cable that I am on about.
4)
a) What can ultraviolet radiation from the sun in small doses give humans?
b) What are the effects on the human body if you are exposed to an excessive amount of UV radiation?
c) What do fluorescent chemicals do when they are exposed to UV radiation?
d)
i) What chemical do fluorescent lights contain?
ii) Give two advantages of using fluorescent lights as opposed to a filament bulb.
e) What are security pens and what use do they have?
5) X-rays are used to see internal structures inside the body.
a)
i) Can X-rays pass through bones?
ii) Can X-rays pass through soft tissue?
b) Why are X-rays and gamma rays used to sterilise food?
c)
i) Give two examples of medical conditions that we can use medical tracers to detect?
ii) Describe how medical tracers can be used to detect the conditions discussed in part c i.
d)
i) What is radiotherapy and explain how it is used to treat people with cancer.
ii) When we undertake radiotherapy, what do we need to be careful of?
b) A fibre optic cable has a glass centre. What is the name and role for the bit around the glass centre of a fibre optic cable? There is an arrow on the above diagram pointing to the part of the fibre optic cable that I am on about.
4)
a) What can ultraviolet radiation from the sun in small doses give humans?
b) What are the effects on the human body if you are exposed to an excessive amount of UV radiation?
c) What do fluorescent chemicals do when they are exposed to UV radiation?
d)
i) What chemical do fluorescent lights contain?
ii) Give two advantages of using fluorescent lights as opposed to a filament bulb.
e) What are security pens and what use do they have?
5) X-rays are used to see internal structures inside the body.
a)
i) Can X-rays pass through bones?
ii) Can X-rays pass through soft tissue?
b) Why are X-rays and gamma rays used to sterilise food?
c)
i) Give two examples of medical conditions that we can use medical tracers to detect?
ii) Describe how medical tracers can be used to detect the conditions discussed in part c i.
d)
i) What is radiotherapy and explain how it is used to treat people with cancer.
ii) When we undertake radiotherapy, what do we need to be careful of?