Two speakers c & d are driven in step at 600 hz by the same audio oscillator. these speakers both start out at 5.0 m from the listener, but speaker c is slowly moved away. if c keeps moving, at what distance d will the speakers produce the second destructive interference at the listener? the speed of sound is 340 m/s.

a) 0.97 m

b) 0.86 m

c) 0.45 m

d) 0.28 m

option B

Explanation:

given,

frequency of the speaker = 600 Hz

speed of sound = 340 m/s

wavelength = ?

for second destructive interference,

the path difference,

k = 2

d = 0.86 m

the correct answer is option B

answer: its c lololo

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