A plane flies at 200 m/s, emitting a 600 Hz roar. Assuming a 340 m/s speed of sound, what will be the frequency of sound waves heard by a stationary observer directly behind the plane? I NEED THIS ASAP PLEASE

A. 247 Hz

B. 260 Hz

C. 378 Hz

D. 400 Hz

378 Hz

Explanation:

When source of sound moves away from stationary listener

f' = f x V / ( V + Vs)

f' = 600 x 340 / ( 340 + 200)

f' = 204000/540

f' = 378 Hz

i guess it’s a and b

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