Answer:
(a) λ=77×10⁻⁶m
(b)Yes its enough to examine entire eye,
(c)λ=16.65μm.
Explanation:
The ultrasonic sound are used to detect problems in human body by using device consisting of transmitter and detector .
The speed of sound in human tissue is 1540m/s.
The wavelength of sound is 20MHz.
(a) let the velocity of sound in human tissue is v = 1540m/s.
v=fλ
λ= 
=
= 77×10⁻⁶m
λ=77×10⁻⁶m
(b) we can scan effectively upto the depth of about 500λ
500λ=500× (77×10⁻⁶)= 3.85cm
Yes its enough to examine entire eye,
(c) In air the velocity of sound is 331m/s.
λ= = 
= 16.65μm
λ=16.65μm.
Answer:
Explanation:
Given data
Ball one
mass m₁=3.0kg
velocity v₁=20 m/s
Ball second
mass m₂=2.0 kg
velocity v₂=12 m/s
First we need the speed of combined ball.Since the system conserves the linear momentum
So the combined velocity vt is:
Since the two balls 1 and 2 are moving in opposite direction
So
Substitute the given values
We have the equation for motion with constant acceleration is given by:
At initial position y₀=0 and vt=v-v₀
So
Answer:
hide on a place where there is no windows take a radio
Explanation:
Answer:
Explanation:
Given
Required
Determine the speed of B w.r.t A
The question implies that, we determine the relative velocity of B w.r.t A
Because both trains are moving towards one another, the required velocity is a 
both trains:
This is shown below:
