To determine which student's wave travels the fastest, we need to consider the speed of the wave. In this case, the speed of the wave can be determined by the product of the frequency and the wavelength.
Since the question does not provide the wavelength for either student's wave, we cannot directly compare their speeds. The speed of a wave depends on the medium through which it is traveling and the properties of the wave, such as its frequency and wavelength.
However, we can make an assumption that the medium through which the wave is traveling and the properties of the wave are the same for both students. If this assumption is correct, then we can compare the speeds of the waves based solely on their frequencies.
The speed of the wave is directly proportional to its frequency. A wave with a higher frequency will travel faster than a wave with a lower frequency, assuming all other factors are the same. Therefore, the student with a higher frequency, which is 4Hz, shakes the slinky faster, indicating that their wave travels faster.
Hence, the correct answer is B. Right, as the wave generated by the student on the right travels faster based on their higher frequency.