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Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are
|
(a) 5I and I |
(b) 5I and 3I |
(c) 9I and I |
(d) 9I and 3I |
Can a metal be used as a medium for dielectric
|
(a) Yes |
(b) No |
(c) Depends on its shape |
(d) Depends on dielectric |
Sun radiates continuously and maintains its brightness because
|
(a) Helium is converted into iron in its core |
|
(b) Of fusion of hydrogen nuclei into helium |
|
(c) Fusion of helium in hydrogen |
|
(d) Burning of carbon, in its core |
A cell is connected between two points of a uniformly thick circular conductor. The magnetic field at the centre of the loop will be (Here 
and 
are the currents flowing in the two parts of the circular conductor of radius ‘a’ and 
has the usual meaning)
|
(a) Zero |
(b) |
(c) |
(d) |
Mean life of a radioactive sample is 100 seconds. Then its half life (in minutes) is
|
(a) 0.693 |
(b) 1 |
(c) 10-4 |
(d) 1.155 |
