Physics Waves MDCAT 2009
PMDC Verified Question 121 of 125
Speed of the waves is equal to:
A
\( f\lambda \)
B
\( \lambda / T \)
C
Both A and B
D
\( \lambda T \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Both A and B
Concept:

Wave speed is defined as the distance a wave travels per unit of time.

Formula:

$$ v = \frac{\text{Distance}}{\text{Time}} $$

Solution:

  • During one time period (\( T \)), the wave travels exactly one wavelength (\( \lambda \)). Therefore, speed \( v = \frac{\lambda}{T} \).


  • Since frequency (\( f \)) is the reciprocal of the time period (\( f = \frac{1}{T} \)), we can substitute this into the equation: \( v = f\lambda \).


  • Both expressions perfectly describe wave speed.


Why other options are incorrect:

Option D (\( \lambda T \)) is dimensionally incorrect (meters \( \times \) seconds instead of meters/second).

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