The frequency of A.C. is 50 Hz. How many times the current becomes zero in one second?

A bulb is connected in alternating current circuit.The frequency of a.c. is 50 Hz. Clearly current becomes zero 100 times in one second, then why does the bulb not lit intermittently? If the frequency of a.c. be 2 Hz, then will the bulb lit intermittently?

An alternating current is given by I=100 sin(5 pi t) . How many times will be current become zero in one second?

If an A.C. current of frequency 50 Hz is flowing through a conducting wire, then how many time does the current becomes zero in one second ?

An a.c. voltage is represented by E = 220 sqrt2 cos (8 pi) t . How many times will the current become zero in 1 sec ?