Question

Two boys have made a cup and string device to try to communicate. The sound wave from the

voice of the boy on the right will have to travel through the cup, the match stick holding the
string, the thread and the other cup and match stick until it reaches the ear of the boy on the
left. Each of these parts has different properties. Which statement is true?
(1 point)
O The frequency remains constant.
O The frequency changes, while the wavelength and speed of the wave rain the same.
O The period changes, while the wavelength and the speed of the wave remain the same.
O The period and the speed of the wave change proportionally.

Answer 1

The sound wave's frequency remains constant as it travels through different media in a cup and string device, while the speed and wavelength can change due to the properties of each medium.

Step-by-step explanation:

When the sound wave from the voice of the boy using a cup and string device moves through different media, such as the cup, match stick, string, and air, the frequency of the sound remains constant. This is because the frequency is determined exclusively by the source. However, the speed of sound can vary with different media. Since the speed of sound and wavelength are related by the equation v = fλ, where v is the speed of sound, f is the frequency, and λ is the wavelength, if the speed v changes but the frequency f remains the same, it necessitates that the wavelength must change.