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Brain, Marshall, and Lance Looper. “Howstuffworks Electromagnets .” Science, HowStuffWorks, /elescience.howstuffworks.comctromagnet.htm.
The frequency is 7.18 × 10^14 Hz, c= 3 × 10^8 m/s, where c is the speed of light.
But; c = λf, where λ is the wavelength of the wave and f is the frequency.
Making λ the subject, we get;
λ = c/f
= (3 ×10^8)/ (7.18 ×10^14)
= 4.17827 × 10^-7 m
but 1 m = 10^9 nm
Therefore;
= (4.17827 ×10^-7) × 10^9
= 417.827 nm
Hence, the wavelength= 417.827 nm
Explanation:
It is given that the value of P is 1110 N. And, for pin connection we have only two connections which are 
and 
. Let T be the tension is rope.
So, 
and - 1110 = 0
= 0
And, 
= 0
T =
Also, 
= 0
1110(0.75 + 0.75 + 0.75) - T(0.5 + 0.1) = 0
2497.5 - 0.6T = 0
T = 4162.5 N
= 4.16 kN
Therefore, we can conclude that the tension in the rope if the frame is in equilibrium is 4.16 kN.
Because north and east are positive directions and south is a negative direction, the answer is 50mi.
30mi north+50mi East-30mi south=50mi.
