The speed of sound in water is about 1500 m/s. What then is the bulk modulus K f

Question

The speed of sound in water is about 1500 m/s. What then is the bulk modulus K for water? This value is a measure of the pressure required to appreciably change the volume of a mass of water.
a) 1.5 x106 Pa
b)2.2 x109 Pa
c)1.5 x109 Pa.
d)2.2x106 Pa

An observer hearing something approaching will hear a __________ pitch than was emitted by the 'something'.
a) similar
b) quieter
c)lower
d) higher

Why is the electric field inside a conductor always zero?
a)The electrons are attracted to the outer boundary of the metal
b)Electrons will move until there is no more force on them
c)The heat of the metal ejects fields
d)The nuclei of metal atoms can move about.

Explanation / Answer

1st answer ) velocity of sound in liquid V=(K/d)1/2

K=V2d=15002(1000)=225(10)7=2.2(10)9 option b)

2nd answer) due to doppler effect higher pitch option d)

3rd answer) electrons will move until there is no more force on them option b)

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