Answer:
Explanation:
The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by :
![B=1.2\times 10^{-6}\sin [2\pi (\dfrac{z}{240}-\dfrac{10^7t}{8})]](https://tex.z-dn.net/?f=B%3D1.2%5Ctimes%2010%5E%7B-6%7D%5Csin%20%5B2%5Cpi%20%28%5Cdfrac%7Bz%7D%7B240%7D-%5Cdfrac%7B10%5E7t%7D%7B8%7D%29%5D)
.....(1)
The general equation of the magnetic field wave is given by :
....(2)
Equation (1) is in form of equation (2), if we compare equation (1) and (2) we find that,
We need to find the frequency of the wave. It is given by :
So, the frequency of the wave is 
Answer:
Mechanical energy is the sum of kinetic and potential energy of a system
Answer
given,
Q u = 8.7 m³/s
Q d= 0.9 m³/s
BOD concentration = 50 mg/L
a) BOD concentration at the down stream
= 4.69 mg/L
b) discharge = 9.6 m³/s
cross sectional area = 10 m²
velocity steam = 
= 0.96 m/s
time taken to move 50 km down stream =
= 52083.3 s
= 
= 0.6 days
now,
They discovered a vaccine to reduce illnesses, specifically Polio and Influenza. The work of Salk and Sabin has almost eradicated what was once a deadly disesase ( polio) . For example, there were 350,000 deaths related to poliovirus across the world in 1988 and they reduced to 22 in 2017. Also, their work has saved millions of lives from polio induced paralysis
When a current is passed through a coil of wire with a piece of iron inside, the one that will be formed is :
an electromagnet
It happens when a soft metal core made into magnet by passage of electric current
hope this helps
