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- 1. Multiple Choice
The electromagnetic spectrum shows the complete range of frequencies of electromagnetic waves from the lowest to the highest, including , in order, radio, infrared, visible light, ultraviolet, x-ray, and gamma rays waves. Which of the following statements below explains how electromagnetic waves are produced?
Electromagnetic waves are produced when some kind of energy moves a substance, a material, or a thing within a medium that will conduct the mechanical energy of motion away from the source.
EM waves are longitudinal waves that are produced when the motion of the individual particles of the medium is in a direction that is parallel to the direction of energy transport.
EM waves are transverse waves that can be created by accelerating charges; moving charges back and forth will produce oscillating electric and magnetic fields, this travel at the speed of light.
EM waves are produced whenever two waves of identical frequency interfere with one another while travelling opposite directions along the same medium.
- 2. Multiple Choice
Which is true about the redio waves in the electromagnetic spectrum?
It has the shortest wavelength and the highest frequency.
It has the longest wavelength and lowest frequency .
It has the longest wavelength and highest frequency.
It has the wavelength and lower frequency.
- 3. Multiple Choice
Which of the following descriptions is true about the use of microwave?
Microwave is used in radio detection and ranging.
Microwave is used to observe event.
Microwave is used to image bone structures.
Microwave is used in heat sensors.
- 4. Multiple Choice
What kind of waves do cellular telephones use to transmit and receive signals?
Microwave
Radio waves
Gamma rays
Ultraviolet rays
- 5. Multiple Choice
Most dermatologist recommend using sunblock as a defense to ultraviolet radiation. Which of the following describes the ability of UV ray which explains the idea of using sunblock?
UV radiation is highly penetrating which can cause suntan.
UV radiation is deeply penetrating which can cause skin cancer.
UV radiation has the highest velocity that can damage the skin.
UV radiation is impermeable to skin which can cause skin cancer.
- 6. Multiple Choice
X-ray are electromagnetic radiation that differentially penetrates structures within the body and creates images of these structures on photographic film or a fluorescent screen. These images are called diagnostic x-rays. Which among the statements below is NOT true?
Diagnostic x-rays are useful in detecting abnormalities within the body.
They are created when an electric current is passed through a vacuum tube.
They are non-invasive way to help diagnose problems such as broken bones, tumors, dental decay, and the presence of foreign bodies though only painful.
X-rays are form of radiation similar to light rays except that they are more energetic than light rays and are invisible to the human eye.
- 7. Multiple Choice
Which of the following statements is NOT true when you are exposed to electromagnetic fields?
At low frequencies, external electric and magnetic fields induce small circulating currents within the body.
The main effect of radiofrequency electromagnetic fields is heating of body tissues.
Short-term exposure to very high levels of electromagnetic fields can be harmful to health.
Exposure to low level electromagnetic field is harmful to human health.
- 8. Multiple Choice
Knowing that electromagnetic radiations are all around us, which of the following factors will NOT be considered when exposed to the different forms of EM radiations?
Distance from the source because electromagnetic radiation is greatest close to the source and decrease quickly with distance from the source.
The frequency of the electromagnetic wave because the higher the frequency, the higher the energy.
The type of electromagnetic wave because it has its own properties and uses.
The size of the electromagnetic wave because the longer the wavelength, the higher the energy.
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