Light
Waves 1
Electromagnetic Spectrum
Electromagnetic Spectrum
Waves 2
100
Name the only visible wave in the EMS.
Visible light.
100
What is the speed that EM waves travels in vacuum?
Speed of light.
100
What is wavelength?
The distance between two identical points on a wave (crest to crest or trough to trough).
100
What part of the spectrum has the shortest waves?
Gamma rays
100
Which wave can cause skin cancer?
UV ray.
200
What is the use of microwave?
Heating food.
200
What is frequency? Define what it is and the unit used.
Frequency is how many waves pass a point in one second. The unit is Hertz.
200
What part of the spectrum has the longest wavlength and lowest energy?
Radio waves
200
___________ have the most energy and _______________ have the least energy.
Gamma have the most energy and radio waves have the least energy.
200
What terms are used to describe "a", "b", "c", and "d"?
A is the crest, b is the trough, c is amplitude, and d is wavelength.
300
What is the use of X-ray?
Medical imaging of the body (eg. bones)
300
Which wave has a longer wavelength than infrared but shorter wavelength than radio wave?
Microwave
300
Name three different ways ultraviolet, x-ray, and gamma rays help us.
Ultraviolet light is used to detect forged bank notes, in blacklights that make things glow, to kill microbes (germs), and to help our bodies produce vitamin D. X-rays are used in airport security and by doctors and dentists to see inside people. Gamma rays help kill cancer.
300
What parts of the spectrum can some organisms see? Be specific.
Organisms can detect visible light. Some birds, bees, and certain fish can see ultraviolet (beyond ultraviolet). Infrared light can be seen by mosquitos, vampire bats, bed bugs, and some snake and beetle species. https://www.nationalgeographic.org/media/infrared-vision/#:~:text=Infrared%20light%20has%20longer%20wavelengths,in%20the%20form%20of%20heat.
300
All waves transfer ____________ from one place to another.
Energy (NOT matter)
400
Which wave has a higher energy than UV but lower energy than gamma ray?
X-ray
400
What is the difference between amplitude and frequency?
Amplitude is the height of the wave. Frequency is the number of sound waves.
400
Name three different parts of the spectrum that can be dangerous and explain how they can cause damage.
Radio= large amounts may cause cancer, leukaemia and other disorders. Microwaves may cause cataracts. Infrared light can cause overheating. Too much visible and ultraviolet light can damage the retina in your eyes. Ultraviolet light can also cause sunburns and skin cancer. X-rays and gamma rays can cause cancer.
400
Name three examples of how radio, microwave, and infrared waves are used in your life.
Radio waves are used for communications like AM and FM radio stations, tv's and police and military communications, and aircraft radios.
Microwaves are used in cell phones, wifi, and microwave ovens.
Infrared is used in remote controls for tv, heat (thermal) lamps are used to heal sports injuries, and can be used to see at night.Infrared is also used in cameras.
400
Which wave has the highest frequency and highest energy?
Gamma ray
500
What is the use of radio waves?
Satellite, Comunication, TV signals
500
Does EM waves need a medium/matter to travel through?
No, it does not need matter. It can travel through vacuum.
500
List all of the waves on the spectrum from longest to shortest wavelength.
Radio waves, microwave, infrared light, visible light, ultraviolet light, x-ray, gamma ray
500
Why is the unit for frequency called 'Hertz'?
Heinrich Hertz was the first person to prove the existence of the electromagnetic waves and made significant impact in the study of the EM Spectrum.
500
Which EM wave can be used for sterilisation in hospital equipment?
UV ray