Which of the following statements about electromagnetic waves in free space are true? (There are two correct answers. Select both.)

Question

BlackTom AI · Accepted Answer

This question asks us to identify two true statements about electromagnetic waves in free space and to justify why the others are false.
Option 1: The higher-frequency waves have shorter wavelengths than the lower-frequency waves. This is correct because, in free space, frequency and wavelength are inversely related by the equation c = fλ, where c is the constant speed of light. Therefore, as frequency increases, wavelength decreases, and vice versa. This direct relationship is a fundamental characteristic of electromagnetic waves.
Option 2: The wavelengths of the visible waves are some of the shortest electromagnetic waves. This is misleading. While visible light has relatively short wavelengths compared with many other waves (like radio or microwaves), it is not accurate to claim they are among the shortest overall; ultraviolet, X-ray, and gamma-ray waves have even shorter wavelengths. So this statement overreaches its scope and is false.
Option 3: The higher-frequency travel faster than the lower-frequency waves. In vacuum, all electromagnetic waves propagate at the same speed, c, regardless of frequency. Hence, frequency does not affect propagation speed, making this statement incorrect.
Option 4: The electric field vector is always at right angles to the magnetic field vector. In free space, plane electromagnetic waves have E and B fields that are perpendicular to each other and to the direction of propagation; this perpendicular (transverse) relationship is a hallmark of EM waves. This statement is true.
Option 5: The wavelengths of the visible waves are some of the longest electromagnetic waves. This is incorrect because visible wavelengths are not among the longest; radio waves have much longer wavelengths, while visible light sits somewhere in the middle of the spectrum. Therefore, this claim is false.

PHYSICS 1201 SU2025 (10585) Final Exam- Requires Respondus LockDown Browser

Which of the following statements about electromagnetic waves in free space are true? (There are two correct answers. Select both.)

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