after the train passed, the pitch of the train whistle became lower. this change in sound would be represented by what change in the diagram above?

a. the distance represented by ''a'' would increase.
b. the distance represented by "a" would decrease.
c. the distance represented by ''c" would increase.
d. the distance represented by "c" would decrease.

A. The distance represented by ''A'' would increase.

Explanation:

The pitch of a sound is how we perceived the frequency of a sound: the higher the frequency, the higher the pitch, the lower the frequency, the lower the pitch.

In this problem, we have a train passing us, and after that, the pitch of the train whistle became lower: this means that the frequency also becomes lower. This effect is known as Doppler effect.

So, we said that the frequency of the sound wave decreases: this means that the wavelength (which is inversely proportional to the frequency) increases. From the graph, we see that the wavelength (distance between two adjacent crests) is represented by 'A': therefore, since we concluded that A must increase, the correct answer is

A. The distance represented by ''A'' would increase.

the cellphone, they would then know if the killer would have contacted them or always hated them. or if it was a breakup. but if that is not the case, then it would be the clothing. to put in a bullet, it would have to be put in by hands. hands have finger prints which, would have giving you the answer of who done it.

explanation:

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.