350km/5.15 hours~68km per hour
Answer:
0.017 m
Explanation:
Wavelength: This can be defined as the distance covered in one complete oscillation by a wave. The S.I unit of wave length is meter (m).
The expression for wave length is given as
v = λf ............................... Equation 1
Where v = speed of sound in air, λ = wave length of sound, f = frequency of sound.
make λ the subject of the equation,
λ = v/f ............................... Equation 2
Given: v = 340 m/s, f = 20000 Hz
Substitute into equation 2
λ = 340/20000
λ = 0.017 m.
Hence the wave length of sound in air = 0.017 m
Answer:
0.09221 V/m
Explanation:
= Vacuum permeability = 
P = Power of transmitter = 250 mW
r = Distance to source = 42 m
c = Speed of light = 
= Electric field amplitude
Intensity of a wave is given by

Intensity is also given by

The electric field amplitude at the receiver when it first fails is 0.09221 V/m
In this graph, what is the displacement of the particle in the last two seconds?of the particle in the last two seconds?
<span>0.2 meters
2 meters
4 meters
6 meters</span>
In this graph, the displacement of the particle in the last two seconds is 2 meters.