A tuned amplifier circuit is used to generate a carrier frequency of 2 MHz for the amplitude modulation. The value of (LC) is
a.12pi x 10^6
b.12 x 10^6
c.13pi x 10^6
d.14pi x 10^6
An observer looks at a distant tree of height 10 m with a telescope of magnifying power of 20 . To the observer the tree appears:
a.10 times taller
b.10 times nearer
c.20 times taller
d.20 times nearer
A lamp emits monochromatic green light uniformly in all directions. The lamp is 3% efficient in converting electrical power to electromagnetic waves and consumes 100 W of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of 5 m from the lamp will be nearly
a.1.34 V/m
b.2.68 V/m
c.4.02 V/m
d.5.36 V/m
Two points on a travelling wave having frequency 500 Hz and velocity 300m/s are 60^o out of phase, then the minimum distance between the two points is
a.0.2
b.0.1
c.0.5
d.0.4
A large number of liquid drops each of radius r coalesce to from a single drop of radius R. The energy released in the process is converted into kinetic energy of the big drop so formed. The speed of the big drop is (given surface tension of liquid T, density r ):
a.(T/r(1/r-1/R))
b.(2T/r(1/r-1/R))
c.(4T/r(1/r-1/R))
d.(6T/r(1/r-1/R))
A large number of liquid drops each of radius r coalesce to from a single drop of radius R. The energy released in the process is converted into kinetic energy of the big drop so formed. The speed of the big drop is (given surface tension of liquid T, density r ):
A large number of liquid drops each of radius r coalesce to from a single drop of radius R. The energy released in the process is converted into kinetic energy of the big drop so formed. The speed of the big drop is (given surface tension of liquid T, density r ):