How is the speed of a mechanical wave related to its period? They are directly related.
They are inversely related.
They are not related.
They are related by a factor of g.

They are inversely related.

Explanation:

The speed of any wave is given in terms of its wavelength and frequency as follows :

Here,

= frequency of a wave

= wavelength of a wave

Also, the frequency of a wave is reciprocal of its frequency. So, the formula becomes :

, T is the time period of a wave

It is clear from above that the speed of a mechanical wave is inversely proportional to its time period. Hence, b is correct option.

mistakes are ok

a) electrical > light, sound, and thermal< < < <

) the mechanical energy of the firefighter moving.< < < < a) electrical > light, sound, and thermal< < < <

c) both a and b.