23 Questions
Which statement about gamma rays is NOT true?
Gamma rays have the longest wavelength among all EM waves.
Which of the following can cause skin cancer, blindness, premature skin aging and sunburn?
ultraviolet
The following are applications of microwaves EXCEPT:
night vision goggles and autofocus cameras
As the frequency of EM waves increases, what happens to the energy?
increases
Which electromagnetic wave can you see with the naked eye?
visible light
Which of the following applications utilizes x-rays?
locating fractures and broken bones
What is another name for electromagnetic waves known as 'heat rays'?
Infrared
Who was responsible for developing equations that showed the relationship between electricity and magnetism?
Maxwell
How are electromagnetic waves arranged from radio wave to gamma ray in terms of wavelength?
Increasing wavelength from constant to infinite value of wavelength
Which set gives the correct sequence of electromagnetic waves based on increasing energy?
Gamma rays, visible light, microwaves, radio waves
How fast do electromagnetic waves move?
The speed of light
Which of the following is paired correctly?
UV radiation: Identifying fake money/banknotes
Satellite communication around the world is brought about by the utilization of ___________.
Microwaves
Which of the following is a potential effect of being exposed to gamma rays?
Blindness
Which of the following is NOT an application of microwaves?
Night vision goggles and autofocus cameras
In the diagram representing the relationship between frequency and energy of electromagnetic waves, what happens to the energy as the frequency of EM waves increases?
Increases
Which electromagnetic wave is visible to the naked eye?
Radio waves
Which application makes use of x-rays?
Heating food in a microwave oven
Which of the following electromagnetic waves is sometimes called heat rays?
Infrared
Who was responsible for developing equations that showed the relationship between electricity and magnetism?
Maxwell
How do electromagnetic waves are arranged from radio wave to gamma ray in terms of wavelength?
Wavelength from infinite to constant value of wavelength
Which set gives the correct sequence of electromagnetic waves based on increasing energy?
Gamma rays, visible light, microwaves, radio waves
When a police officer uses radar for speed control, what kind of electromagnetic waves does he use?
Radio waves
Study Notes
Electromagnetic Waves Overview
- Gamma rays are the most energetic form of electromagnetic radiation, used in medical treatments but can be harmful.
- Skin cancer, blindness, premature aging, and sunburn are caused primarily by ultraviolet rays, which are part of the sun's spectrum.
- Microwaves are widely used for cooking, but an application that does not involve them may include health imaging without any microwaves.
- As the frequency of electromagnetic waves increases, the energy also increases, following the equation E = hf.
- The visible spectrum, which is the range of electromagnetic waves that can be seen by the naked eye, includes wavelengths around 400-700 nm.
- X-rays are utilized primarily in medical imaging to view the inside of an object or the human body.
- Infrared rays are another name for electromagnetic waves known as 'heat rays', commonly used in heating and night-vision technologies.
Historical Context
- James Clerk Maxwell developed foundational equations that unify electricity and magnetism, forming the basis of electromagnetism.
Arrangement of Electromagnetic Waves
- Electromagnetic waves are arranged from radio waves (longest wavelength, lowest energy) to gamma rays (shortest wavelength, highest energy).
- The sequence of electromagnetic waves in order of increasing energy is: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, gamma rays.
Speed of Electromagnetic Waves
- All electromagnetic waves travel at the speed of light in a vacuum, approximately 299,792 kilometers per second (km/s).
Applications of Electromagnetic Waves
- Satellite communication employs radio waves for data transmission around the globe.
- Exposure to gamma rays can lead to severe health effects, including radiation sickness and increased cancer risk.
- Non-application of microwaves can include uses not related to cooking, such as certain lighting technologies.
- In police radar, the type of electromagnetic waves employed are microwaves, useful for detecting speed.
Frequency and Energy Relationship
- In a graphical representation, as the frequency of electromagnetic waves increases, the energy also rises exponentially, indicating a direct correlation.
This summative test covers topics related to radiation and electromagnetic waves, including gamma rays. It includes multiple-choice questions testing knowledge about gamma rays and their properties, as well as their effects on health.
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