A Level Physics Practice Exam

What is the wavelength if the speed of a wave is 1500 m/s and frequency is 2500 Hz?

1. 0.2 m

2. 0.6 m

3. 0.3 m

4. 3 m

The correct answer is: 0.6 m

To determine the wavelength of a wave, you can use the fundamental wave equation: \[ \text{Speed} = \text{Wavelength} \times \text{Frequency} \] In this case, the speed of the wave is given as 1500 m/s and the frequency is 2500 Hz. Rearranging the wave equation to solve for wavelength gives: \[ \text{Wavelength} = \frac{\text{Speed}}{\text{Frequency}} \] Substituting the known values into this equation provides: \[ \text{Wavelength} = \frac{1500 \, \text{m/s}}{2500 \, \text{Hz}} = 0.6 \, \text{m} \] This calculation shows that when you divide the speed of the wave by the frequency, you arrive at a wavelength of 0.6 meters. Thus, the correct answer aligns with this calculation, confirming that the wavelength is indeed 0.6 m.