Question

what is the difference between By+ a period time and In + a period time

Answer 1

Answer:

By ( तक)

In( की अवधि के अन्दर)

वह एक महीने के अंदर आएगा

He will come in a month.

वह एक महीने तक नहीं आएगा

He will not come by one month.

Answer 2

The crucial difference between period and frequency is that period is the duration in which a complete wave cycle is achieved. As against frequency is the number of complete cycles of a wave occurring in a specific amount of time.