Question

Q1. the ratio of velocity of sound in air at4 atmosphere and that at 1 atmosphere is
a) 1:1
b) 4:1
c)1:4
d)3:1

Q2. in what manner does the escape velocity of a particle depend upon its mass
a)m raised to the power 2
b)m
c)m raised t the power -1
d) m raised t the power 0

Q3. which of these is true for an object thrown vertically upwards waith velocity u reaches max. height h after time t sec .(more than one can be correct )
a)at height h/2 from ground , its velocity is u/2
b)at time t its velocity is u

Answer 1

1-b because velocity equals to the elasticity of the medium and since the pressure is Greater the first case if the ratio is equals to 4 is to 1