Which voice can produce a pitch that has a speed of 343 m/s and a wavelength of 0.68 m? check all that apply. bass baritone tenor contralto sopran

Tenor, contralto and sopran will be produced a pitch.

Explanation:

Given that,

Speed  =343 m/s

Wavelength = 0.68 m

Using the formula of frequency of sound

We know that,

The frequency is

Bass = 87 Hz to 330 Hz

Baritone = 87 Hz to 349 Hz

Tenor = 130 Hz to 523 Hz

Contralto = 175 Hz to 690 Hz

Sopran = 110 Hz to 880 Hz

So, according to the frequency, we can explain that which voice will produce a pitch.

Hence, Tenor, contralto and sopran will be produced a pitch.

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27

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