JAMB Physics 2019 Objective — Question 8
Question 8 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2019 Objective paper, with the correct answer and a full explanation.
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Which of the following is true about electromagnetic waves?
- A. they are longitudinal
- B. they can be seen
- C. they travel at the same speed in vacuumCorrect
- D. they have the same frequency in vacuum
Explanation
Electromagnetic waves are transverse (not longitudinal), most cannot be seen, and they all travel at the same speed in vacuum, though they have different frequencies and wavelengths (radio, infrared, visible light, UV, X-ray, gamma ray — increasing frequency, decreasing wavelength).
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