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Explain the term 'critical frequency' in relation to sky wave propagation of electromagnetic waves.
On a particular day, the maximum frequency reflected from the ionosphere is 10 MHz on another day, it was found to reduce to 8 MHz calculate the ratio of the maximum electron densities of the ionosphere on the two days
If two forces P & Q act at such an angle that the resultant force r=p. Then show that if P is doubled the new resultant is at right angle Q and it's value is ( 4P 2 -Q 2 ) 1/2
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The resultant of two forces 3P and 2P is R. If the first force is doubled then the resultant is also doubled. then the angle between the two forces us. plz xplain with the solution
how can i make project on human eye and its defects?
According to Eisenstein's quantum theory light propagates in the bundles of power, every packet being called as photon and possessing energy.
When two objects collide like there velocities are not in the line of action of contact force then the collision is known as oblique collision. We can split also oblique collisi
The signal which has only two values. I.e. either a constant high value of voltage or zero value is known as digital voltage signal
what is significance of kirchoff''s law?
(a) Two 40 g ice cubes are dropped into 220 g of water in a thermally insulated container. If the water was initially at25°C, and the ice came directly from a freezer at -15°C,what
A secondary cell is that cell is which the electrical energy is first up as a chemical energy and when the current is taken from the battery, the chemical power is reconverted into
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