You've entered the Great Space Race. Your engines are hearty enough to keep you in second place. While racing, the person in front of you begins to have engine troubles and turns on his emergency lights that emit at a frequency of 5.900x10¹⁴ Hz.
If the person in front of you is traveling 2616 km/s faster than you when he turns on his lights, what is the frequency of the emergency lights that you observe when it reaches you in your spaceship?

Explanation:

We shall apply the formula of red shift in radiation when a source of light moves away from the earth . Change in wavelength and velocity of source are related by the following formula .

Δλ / λ = v / c , Δλ is change in wavelength of source radiation ,  λ is original wavelength , v is velocity of source and c is velocity of light .

Δλ  in this case is positive as source is going away .

v = 2616 x 10³ m /s , c = 3 x10⁸ m /s

λ  = 3 x 10⁸ / 5.9 x 10¹⁴ = .50847 x 10⁻⁶ m

Δλ / λ = v / c

Δλ / .50847 x 10⁻⁶ = 2616 x 10³ /  3 x10⁸

Δλ / .50847 x 10⁻⁶ = 872 x 10⁻⁵

Δλ  = .50847 x 10⁻⁶ x  872 x 10⁻⁵

= 443.385 x 10⁻¹¹

= .00443385 x 10⁻⁶

apparent wavelength = λ +Δλ

= .50847 x 10⁻⁶ + .00443385 x 10⁻⁶

= .51290385 x 10⁻⁶

apparent frequency = 3 x 10⁸ / .51290385 x 10⁻⁶

= 5.85 x 10¹⁴ Hz.

the answer is kevlar

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