The intensity distribution of X-rays from two coolidge tubes operated on different voltages V1 and V2 and using different target materials of atomic numbers Z1 and Z2 is shown in the figure. Which one of the following inequalities is true?
|
(a) V1 > V2, Z1 < Z2 |
(b) V1 > V2, Z1 > Z2 |
(c) V1 < V2, Z1 > Z2 |
(d) V1 = V2, Z1 < Z2 |
(a) V1 > V2, Z1 < Z2
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A particle of mass M at rest decays into two particles of masses m1 and m2, having non-zero velocities. The ratio of the de-Broglie wavelengths of the particles, 
is
|
(a) |
(b) |
(c) 1.0 |
(d) |
The capacities of two conductors are 
and 
and their respective potentials are 
and 
. If they are connected by a thin wire, then the loss of energy will be given by
|
(a) |
(b) |
(c) |
(d) |
A spherical condenser has inner and outer spheres of radii a and b respectively. The space between the two is filled with air. The difference between the capacities of two condensers formed when outer sphere is earthed and when inner sphere is earthed will be
|
(a) Zero |
(b) 4π |
(c) 4π |
(d) 4 π |
The distance between charges 5 × 
and -2.7 
is 0.2 m. The distance at which a third charge should be placed in order that it will not experience any force along the line joining the two charges is
|
(a) 0.44 m |
(b) 0.65 m |
(c) 0.556 m |
(d) 0.350 m |
The magnetic flux linked with a coil is given by an equation ∅ (in webers) = 
. The induced e.m.f. in the coil at the fourth second will be
|
(a) 16 units |
(b) 39 units |
(c) 67 units |
(d) 145 units |
Which of the following is not the property of a cathode ray
|
(a) It casts shadow |
(b) It produces heating effect |
|
(c) It produces flurosence |
(d) It does not deflect in electric field |
A point charge q is placed at a distance a/2 directly above the centre of a square of side a. The electric flux through the square is
|
(a) |
(b) |
(c) |
(d) |
