Agrating that has 3900 slits per cm produces a third- order fringe at a 28.0° angle. what wavelength of light is being used? express your answer to two significant figures and include the appropriate units.

Explanation:

Given that,

Number of slits per cm,

The third fringe is obtained at an angle of,

We need to find the wavelength of light used. The grating equation is given by :

, n = 3

So, the wavelength of the light is 400 nm. Hence, this is the required solution.

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electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia