Adv EM spectrum

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.

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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.

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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.

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What kind of waves do cellular telephones use to transmit and receive signals?

• Microwave

• Radio waves

• Gamma rays

• Ultraviolet rays

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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.

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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.

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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.

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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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Which portion of the electromagnetic spectrum includes the range of light that can be detected by the human eye? 

• ultraviolet light
• visible light
• infrared light
• x-rays

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Which of the following electromagnetic waves is given off as heat? 

• ultraviolet light
• x-rays
• gamma rays
• infrared rays

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