Physics Waves MDCAT 2009
PMDC Verified Question 123 of 125
Speed of light, radio waves and microwaves in vacuum is:
A
\( 3 \times 10^5 \text{ ms}^{-1} \)
B
\( 3 \times 10^6 \text{ ms}^{-1} \)
C
\( 3 \times 10^3 \text{ ms}^{-1} \)
D
\( 3 \times 10^8 \text{ ms}^{-1} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: \( 3 \times 10^8 \text{ ms}^{-1} \)
Concept:

Light, radio waves, and microwaves are all forms of electromagnetic (EM) radiation.

Solution:

  • All electromagnetic waves, regardless of their frequency or wavelength, travel at the exact same universal speed limit through a perfect vacuum.


  • This constant speed (\( c \)) is approximately \( 3 \times 10^8 \text{ m/s} \).


Why other options are incorrect:

Options A, B, and C represent speeds that are vastly slower than the true speed of light in a vacuum.

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