The number of telephone conversations by a fibre of band width 40MHz, with much less intensity loss, are:

The number of telephonic messages which are carried by a fibre at an instant with much less intensity loss are

The number of all prime numbers less than 40 is ..

An optical fibre can offer a band width of ________.

An optical fibre can offer a band width of ________.

In young's experiment of double slit, the number of times the intensity of the central bright band greater than the individual intensity of the interfering waves

The number of AM broadcast stations that can be accomodated in a 140kHz band width for the highest modulating frequency 10 kHz will be