Acertain sound contains the following frequencies: 400 hz, 1600 hz, and 2400 hz. select the best description of this sound view available hint(s) ▼ hint 1. how to identify a fundamental within a series of frequencies a. this is a pure tone. b. this is a complex tone with a fundamental of 400 hz, plus some of its overtones. c. this is a complex tone with a vrtual pitch of 800 hz d. these frequencies are unrelated, so they are probably pure tones from three different sound sources.

b)

Explanation:

The 3 frequencies found in the sound waveform (400, 1600, and 2400 Hz are related between them, being 400 Hz the fundamental frequency of the sound, and 1600 Hz and 2400 Hz, harmonics (overtones of the fundamental) according to this relationship:

1600 Hz = 4* 400 Hz (4th Harmonic)

2400 Hz = 6* 400 Hz (6th Harmonic)

carla slowed down in the beginning of her trip, stopped, and then sped up

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