
Guess Paper – 2012 Class – X Subject – Mathematics REAL
... iii. The sum of the digits of a two –digits number is 9. Also, nine times this number is twice the number obtained by reversing the order of the digits. Find the number. iv. Selma went to a bank to withdraw Rs. 2000. She asked the cashier to give her Rs 50 and Rs 100 notes only. Selma got 25 notes i ...
... iii. The sum of the digits of a two –digits number is 9. Also, nine times this number is twice the number obtained by reversing the order of the digits. Find the number. iv. Selma went to a bank to withdraw Rs. 2000. She asked the cashier to give her Rs 50 and Rs 100 notes only. Selma got 25 notes i ...
Mathematics of radio engineering

The mathematics of radio engineering is the mathematical description by complex analysis of the electromagnetic theory applied to radio. Waves have been studied since ancient times and many different techniques have developed of which the most useful idea is the superposition principle which apply to radio waves. The Huygen's principle, which says that each wavefront creates an infinite number of new wavefronts that can be added, is the base for this analysis.