S2 Radiations beyond the visible - revision Flashcards
(23 cards)
Arrange the colours of the spectrum in order
[Red, orange, yellow, green, blue, indigo, violet]
This is the visible spectrum of light.
Find two uses of Infra-red (IR) radiation
[Keeping food and small animals warm, remote control devices]
IR radiation is commonly used in various applications due to its heat properties.
What technology can be used to detect IR?
[Thermal imaging camera]
Thermal cameras visualize heat emitted by objects.
Find two things that give off IR
[Anything that gives off heat, animals, people, the sun, hot engines]
These objects emit IR radiation as a byproduct of heat.
What type of chemicals absorb Ultra violet radiation (UV) then give off energy?
[Fluorescent chemicals]
These chemicals are used in various lighting applications.
Our skin absorbs UV, to produce what?
[Vitamin D]
Vitamin D is essential for bone health.
UV can be used to treat a skin condition. Which?
[Acne]
UV therapy is a common treatment for acne.
What are the problems of too much UV?
[It causes sunburn and cancer]
Overexposure to UV radiation poses significant health risks.
What is the main source of UV?
[The sun]
The sun emits UVA and UVB rays that can harm the skin.
How could you protect yourself from too much UV?
[Stay in shade, wear clothing, sunglasses, and sun cream]
These measures help minimize UV exposure.
Name two ways that microwaves can be used
[Heating food, mobile phone signals]
Microwaves are utilized in both cooking and communication.
Microwaves are found in the Universe, what do they tell us about the Universe?
[It is cosmic background radiation, it tells us the universe is expanding]
This radiation provides evidence for the Big Bang theory.
What can be used to detect X-rays?
[Photographic film]
Photographic film reacts to X-ray exposure.
How does it show the presence of X-rays?
[It turns black]
The blackening of film indicates exposure to X-rays.
Give two uses of X-rays
[Detecting broken bones, airport security, treating cancers]
X-rays are essential in medical diagnostics and security.
Radio waves are mostly used for communication. Give two devices they are used in.
[Television transmission, Broadcast Radio, Police radios, Taxi radios]
Radio waves facilitate various forms of communication.
What is the relationship that links frequency, number of waves and time?
[Frequency = Number of waves/time (Secs)]
This formula is fundamental in wave physics.
What is the unit of frequency?
[Hertz]
Hertz measures the number of cycles per second.
What type of material can be used to block gamma waves?
[Thick lead]
Lead is effective due to its density.
Give two sources of gamma rays.
[Rocks, Cosmic rays from space]
Gamma rays can originate from natural and cosmic sources.
What are the dangers of gamma rays?
[Can damage DNA in cells causing cancer]
Gamma rays pose serious health risks due to their ionizing nature.
What can gamma rays be used for?
[Medical tracing of chemicals passing through the body, industrial tracing through pipes]
Gamma rays have applications in both medicine and industry.
What protections can be taken to protect against the dangers of gamma rays?
[Reduce time of exposure, protective clothing, store in lead containers, handle with tongs]
These measures help ensure safety when working with gamma radiation.
