It may be one of the following reasons:
50Hz
It used to be. Now it is not used anymore.
500 manpower X 40 hours a week X 50 weeks per year = 1000000
50 Hz is the frequency of alternating current (ac) used by national electricity power services in Europe and several other world areas whilst 60 Hz is used in USA, Canada and many other countries in the world. 50 Hz means or specifies "50 cycles per second". Hz is the international technical abbreviation for the scientific unit of frequency, the hertz.
The currency used in India is the Rupee. The currency is distributed by the Reserve Bank of India and is available in several denominations such as 5, 10, 20, 50, 100, 500, and 1,000.
50Hz
The standard AC mains in India is 230V/50 Hz .
50 herzes in INDIA and 60 hz in USA
The voltage requirements for power outlets in India are typically 230 volts at a frequency of 50 hertz.
Can be any frequency but is most likely to be the grid frequency - 50/60 Hz.
In most parts of the world this is 50 Hz, although in the Americas it is typically 60 Hz. Current usage by country or region is given in the list of mains power around the world at: http://en.wikipedia.org/wiki/Utility_frequency
50 hertz.
It used to be. Now it is not used anymore.
the voltage and frequency are 110v and 50(or)60hz because the devices which are invented in us are work at that voltage and it is efficient for that devices.
The half-wave rectifier is conducting during only half of each cycle, so the fundamental output frequency is 50 Hz, and there are loads of harmonics of 50 Hz. also present in the output.
Period = reciprocal of frequency ( 1 / frequency ) = 1/50 = 0.02 second = 20 milliseconds
The main difference between 50 Hz and 60 Hz is the frequency at which they operate. 50 Hz is a standard frequency used in many countries for electrical systems and appliances, while 60 Hz is commonly used in countries like the United States. The higher the frequency, the faster the alternating current cycles.