The slits in a Young's double slit experiment have equal widths and the source is placed symmetrically relative to the slits. The intensity at the central fringes is I0. If one of the slits is closed, the intensity at this point will be
|
(a) I0 |
(b) I0 / 4 |
(c) I0 / 2 |
(d) 4I0 |
(b) I0 / 4
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The magnetic moment of a current carrying loop is 2.1 
. The magnetic field at a point on its axis at a distance of 1 
is
|
(a) 4.2 |
(b) 4.2 |
|
(c) 4.2 |
(d) 4.2 |
The e.m.f. in a thermoelectric circuit with one junction at ૦℃ and the other at t℃ is given by 
. The neutral temperature is then
(a) 
|
(b) - 
|
(c) - 
|
(d)
|
A person sees his virtual image by holding a mirror very close to the face. When he moves the mirror away from his face, the image becomes inverted. What type of mirror he is using
|
(a) Plane mirror |
(b) Convex mirror |
(c) Concave mirror |
(d) None of these |
Number of secondary electrons emitted per number of primary electrons depends on
|
(a) Material of target |
(b) Frequency of primary electrons |
|
(c) Intensity |
(d) None of the above |
Assertion : The phenomenon of X-ray production is basically inverse of photoelectric effect.
Reason : X-rays are electromagnetic waves.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
