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Which of the following are correct regarding electromagnetic radiation? a. Gamma rays are a form of electromagnetic radiation b. The particles have a mass equivalent to that of neutrons c. In a vacuum, the velocity of the particles differs depending on their individual properties d. It results in a sinusoidal graph when magnetic field strength is plotted against time e. The frequency is the interval between two successive crests |
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Answer» a. True. Electromagnetic radiation is named according to how it is produced, e.g. X-rays (X-ray tube), gamma rays (radioactive nuclei). b. False. The different types of electromagnetic radiation differ in their properties and are made up of photons, which do not have a mass or electric charge. c. False. All forms of electromagnetic radiation travel with the velocity of light in a vacuum. d. True. Electromagnetic radiation produces a sinusoidal graph when electric or magnetic field strength is plotted against time or distance, travelling with velocity (C). The peak field strength is called the amplitude (A). e. False. Frequency (f ) is the number of crests passing a point in a second. The interval between successive crests is called the period. |
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