How deep is the water if it takes a pulse of ultrasound 0.8s to be received back at the boat. the speed of ultrasound is 1600m/s in water
firstly we know how fast the wave is travelling and we know for how long so using our speed equals distance over time equation we can rearange for distance (D= VT).
we can the plug in our speed(V) and our time (T) to get distance = 1600 x 0.8 this gives use a distance of 1280 m.
however we have to rememeber that the wave had to go down to the sea floor then back up to the boat so it has travelled two times the depth of the sea.
therefore the depth of the sea is 1280 / 2 = 640m
RC
Related Physics GCSE answers
All answers ▸The potential difference in a circuit is 5V. There are two resistors connected in series of resistance 10 Ohms. Calculate the current I in the circuit.
Name and describe both of Kirchhoff's laws.
How does electromagnetic induction produce a current?
A force is applied to a box of mass 2kg so that is accelerates at 2ms^-2. Find the force acting on the box and thus calculate the work done in moving the box 10m in the direction of the force.