Answer:
Poynting vector, ![S=1.03\times 10^{7}\ W/m^2](https://tex.z-dn.net/?f=S%3D1.03%5Ctimes%2010%5E%7B7%7D%5C%20W%2Fm%5E2)
Explanation:
It is given that, The electric and magnetic fields of an electromagnetic wave are given by :
Electric field, ![E=6.25\times 10^{-3}\ V/m](https://tex.z-dn.net/?f=E%3D6.25%5Ctimes%2010%5E%7B-3%7D%5C%20V%2Fm)
Magnetic field, ![B=2.08\times 10^{-11}\ T](https://tex.z-dn.net/?f=B%3D2.08%5Ctimes%2010%5E%7B-11%7D%5C%20T)
We need to find the Poynting vector for this wave. the Poynting vector is given by :
![S=\dfrac{1}{\mu_o}EB](https://tex.z-dn.net/?f=S%3D%5Cdfrac%7B1%7D%7B%5Cmu_o%7DEB)
![S=\dfrac{1}{4\pi \times 10^{-7}}\times 6.25\times 10^{-3}\times 2.08\times 10^{-11}](https://tex.z-dn.net/?f=S%3D%5Cdfrac%7B1%7D%7B4%5Cpi%20%5Ctimes%2010%5E%7B-7%7D%7D%5Ctimes%206.25%5Ctimes%2010%5E%7B-3%7D%5Ctimes%202.08%5Ctimes%2010%5E%7B-11%7D)
![S=1.03\times 10^{7}\ W/m^2](https://tex.z-dn.net/?f=S%3D1.03%5Ctimes%2010%5E%7B7%7D%5C%20W%2Fm%5E2)
So, the Poynting vector for this wave is
. Hence, this is the required solution.
Answer:
0.692" arc sec.
Explanation:
Tan Ꝋ = Sin Ꝋ = ꝊR = 1.22 (Wavelength) / d
ꝊR = 1.22 x 550 x 10^-9m / 0.2m
= <em>3.355 x 10^-6 rad</em> x (3600 × 180) / π = 0.692" arc sec.
Answer:
This is because normal force is exerted perpendicularly to the point of contact between the upper and lower objects.
Explanation:
This is because the upper object is still subject to gravitational pull. Therefore, the amount of force it exerts on the lower object due to gravity will be equal to the normal force that acts in the negative direction of gravitational force. Additionally, normal force is evident because the upper object will not go into the lower object.
Answer:
1. Leaving trash on the ground and not picking it up.
2. Polluting the lake, if your neighborhood has one.
3. Outside people come and dump their waste to your neighborhood.
Hope this helps!