A point P is 5 m vertically above a horizontal rectangle of dimensions 6 m x 3 m. If the vertical from P is outside the boundary of the rectangle and 4 m from one narrow edge but in line with one wide edge, what solid angle does the rectangle subtend at P and what is its average illuminance if a source at P emits 1000 cd in all directions?

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A: Given, Wavelength λ = 660 nm = 660 x 10-9 m Separation between slits d = 0.0800 mm = 0.0800 x 10-3 m…

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Q: 27. Which wavelength is not a possibility for a 1 m long pipe open at both ends? O A. 0.25 m B. 0.5…

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Electromagnetic Waves

Electromagnetic waves are waves that consist of magnetic field and electric field components perpendicular to each other. These field components are also perpendicular to the direction of propagation of the wave.