# helppp i can't do this physics

In a different investigation, the teacher wanted to determine the speed of water waves
in the ripple tank.
The teacher did not measure the wavelength of the wave.
Explain how the teacher could determine the speed of the wave
Hi, I am currently studying this topic. From my knowledge, the speed should be constant, here's why.
The ripple tank can be used to observe waves. A rod at the end is used to create ripples by vibrating it. This causes the ripples (parallel lines) to travel at constant speed which can be seen using a bright light source. The water does not travel through a medium which could be another reason for its constant speed. The parallel lines are known as wavefronts. Hope this helps.
i cant do physics either . Good luck lad
still dont get it
Original post by iris kh
In a different investigation, the teacher wanted to determine the speed of water waves
in the ripple tank.
The teacher did not measure the wavelength of the wave.
Explain how the teacher could determine the speed of the wave

What was the first part of the question?
To determine the speed of a wave, you need the wavelength and either frequency of the wave or the time period of the wave. You can't get the speed without wavelength unless you can somehow compare the speed of the wavefronts in the water to some other known wavefront's speed.