Answer:
(a) 
(b) 
Explanation:
Given data
The source is 1.00 μW
The point is 3m away from the point source
For Part (a)
The intensity at a certain distance from a point source that emits sound wave is given as:
For Part (b)
The Sound level is given by
β=(10dB)×log(I/I₀)
Where
I₀=1×10⁻¹²W/m²
Substitute the given values to find Sound level
So
Answer: Velocity involves a particular direction, i.e. North. Speed does not include a direction.
Answer:
Explanation:
Energy stored in spring = 1/2 k x²
80 = 1/2 x k .2²
k = 4000 N /m
Required force = k x
= 4000 x .2
=800 N
b )
Additional work done
= difference in stored elastic energy
= 1/2 k ( x₂² - x₁² )
= .5 x 4000 ( .4² - .2² )
= 240 J
The answer is 20 meters would be the water depth started to feel bottom. This is half of the wavelength. The reason behind this is the wave travels half or the partial of the wavelength underneath the surface. For that reason that is where the wave would be starting to feel the ground.
