Physics Alternating Current PMDC Conceptual Practice
PMDC Verified Question 16 of 127
Electromagnetic radiation that propagates with a very high frequency will have a ____ wavelength.
A
Variable
B
Unchanged
C
Long
D
Short
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Short
Concept:

Wavelength and frequency are inversely proportional to each other for any electromagnetic wave traveling at a constant speed in a vacuum.

Formula:

$$c = f \lambda \implies \lambda = \frac{c}{f}$$

Solution:

Because the speed of light \( c \) is a constant (\( 3 \times 10^8\text{ m/s} \)), any increase in the frequency \( f \) of the radiation must result in a corresponding proportional decrease in its wavelength \( \lambda \). Therefore, high-frequency waves always have a short wavelength.

Why other options are incorrect:

  • Long wavelengths correspond to low-frequency waves, which is the opposite of the given condition.

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