The average female voice emits a sound with a wavelength of 0.85 m. Given the speed of sound in air at 340 m/s, what is the frequency:

The frecuency is 400 Hz.

Explanation:

In a periodic wave the wavelength is the physical distance between two points from which the wave repeats itself. It is named by (λ). That is, the wavelength is the minimum distance between two points on the wave that are in the same state of vibration.

Frequency is represented by the letter f, and is the number of vibrations that occur in a unit of time. That is, how many ridges or valleys are repeated in a unit of time.

The propagation speed is the speed with which the wave propagates in the medium, that is, it is the magnitude that measures the speed at which the wave's disturbance propagates along its displacement. Relate the wavelength (λ) and the frequency (f) inversely proportional using the following equation: v = f * λ.

In this case:

Replacing:

340 m/s= f* 0.85 m

Solving:

f= 400 Hz

The frecuency is 400 Hz.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.