- #1
bnwchbammer
- 7
- 0
Homework Statement
A hiker shouts toward a vertical cliff 735 m away. The echo is heard 4.00 s later.
(a) What is the speed of sound of the hiker's voice in air?
[] m/s
(b) The wavelength of the sound is 0.732 m. What is its frequency?
[] Hz
(c) What is the period of the wave?
[] ms
(taken from webassign)
Homework Equations
I would have thought it was V=d/s, but it doesn't work that way with this wave problem. Do I need to know the speed of sound?
The Attempt at a Solution
I took 735/4 but it told me it was the wrong answer. I'm pretty sure I could figure out the rest of the problem if I could find velocity, so any help with that?
While I'm at it though
Homework Statement
Water waves in a shallow dish are 5.5 cm long. At one point, the water moves up and down at a rate of 5.5 oscillations per second.
(a) What is the speed of the water waves?
[] m/s
(b) What is the period of the water waves?
[] s
Similar to the last problem, but I'm really clueless for this one.
I have until midnight to get these problems finished, so quick help would be appreciated. I don't even need the answer necissarily, just a way of solving it. Thanks