Pls solve this:

if u solve this, I will surely mark u as brilliant

The frequency of a pendulum is .

Explanation:

Time period is defined as the time required to produce complete wave.

As we know that the frequency and time are inversely proportional to each other.

That means,

Where,

is frequency of pendulum

T is time period

Given:

Time period = 5 seconds

Now putting all the given values in the above formula, we get the frequency of the pendulum.

Therefore, the frequency of a pendulum is .

the part of the wave he is travelling on is the crest

it has to be b, about 97 percent.