Physics Waves MDCAT 2017
PMDC Verified Question 105 of 125
If a wave travelling at a speed of 130 m/s and has a wavelength of 5m. Then find out the frequency of the wave?
A
650 Hz
B
\( 3.8 \times 10^2 \text{ Hz} \)
C
20 Hz
D
26 Hz
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: 26 Hz
Concept:

Frequency, wavelength, and wave speed are related by the universal wave equation.

Formula:

$$ v = f \lambda $$

Solution:

  • We are given the velocity \( v = 130 \text{ m/s} \) and the wavelength \( \lambda = 5 \text{ m} \).


  • Rearrange the formula to solve for frequency: \( f = \frac{v}{\lambda} \).


  • Substitute the values: \( f = \frac{130}{5} = 26 \text{ Hz} \).


Why other options are incorrect:

Option A comes from wrongly multiplying the values (\( 130 \times 5 = 650 \)).

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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