Two different types of rope with different properties are fused together to make one long rope. When a wave transfers from the first type of rope to the second type of rope, the wavelength becomes one-fourth of what it was before the transfer. What is true about the speed of the wave?(1 point)

Responses

The speed of the wave becomes one-fourth its original speed after the transfer.
The speed of the wave becomes one-fourth its original speed after the transfer.

The speed of the wave becomes double its original speed after the transfer.
The speed of the wave becomes double its original speed after the transfer.

The speed of the wave remains the same after the transfer.
The speed of the wave remains the same after the transfer.

The speed of the wave becomes four times its original speed after the transfer.

1 answer

To determine how the speed of the wave changes as it moves from one type of rope to another, we can use the relationship between wave speed (\(v\)), frequency (\(f\)), and wavelength (\(\lambda\)). The relationship is given by:

\[ v = f \cdot \lambda \]

When the wave travels from the first rope to the second rope, the speed changes in relation to changes in wavelength and frequency. According to the problem, when the wave moves to the second rope, the wavelength (\(\lambda\)) becomes one-fourth of its original wavelength (\(\lambda_1\)). Thus:

\[ \lambda_2 = \frac{1}{4} \lambda_1 \]

We also know that the frequency of the wave must remain constant when it transitions between different media (assuming no energy is lost).

Given that the frequency remains the same, we can denote the initial wave characteristics as:

\[ v_1 = f \cdot \lambda_1 \]

And after the transition, we have:

\[ v_2 = f \cdot \lambda_2 = f \cdot \left(\frac{1}{4} \lambda_1\right) = \frac{1}{4} (f \cdot \lambda_1) = \frac{1}{4} v_1 \]

This means that the speed of the wave in the second rope (\(v_2\)) becomes one-fourth of its original speed (\(v_1\)).

Therefore, the correct response is:

The speed of the wave becomes one-fourth its original speed after the transfer.