
- A200nm
- B100nm
- C350nm
- D175nm

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Three charges -
and
are placed as shown in the figure. The x-component of the force on -
is proportional to

|
(a) |
(b) |
(c) |
(d) |
A solenoid is at potential difference 60 V and current flows through it is 15 ampere, then the resistance of coil will be
|
(a) 4 Ω |
(b) 8 Ω |
(c) 0.25 Ω |
(d) 2 Ω |
When
transforms to
, then the number of the emitted a- and b-particles is, respectively
|
(a) 8α, 7β |
(b) 4α, 7β |
(c) 4 α, 4β |
(d) 4α, 1β |
nucleus after absorbing energy decays into two α - particles and an unknown nucleus. The unknown nucleus is
|
(a) Nitrogen |
(b) Carbon |
(c) Boron |
(d) Oxygen |
Two ideal slits S1 and S2 are at a distance d apart, and illuminated by light of wavelength λ passing through an ideal source slit S placed on the line through S2 as shown. The distance between the planes of slits and the source slit is D. A screen is held at a distance D from the plane of the slits. The minimum value of d for which there is darkness at O is

|
(a) |
(b) |
(c) |
(d) |