A sound wave is sent at the bottom of a sea. If the echo is heard after 2 sec- calculate the depth of the sea. The speed of sound in water is 1500 m/s.

3000

Explanation:

Basic kinematics (also probably one of the first formulas in your physics textbook):

Velocity=Distance÷Time

Time=2sec

Velocity=1500 m/s

Distance=??

Rearrange the variables to find the last unknown:

Distance=Velocity×Time

=1500×2

=3000 m

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

d) physical means can be used to separate the components of air.