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An X-ray has a wavelength of 0.010 Å. Its momentum is
| (a) 2.126 × 10–23 kg-m/sec | (b) 6.626 × 10-22 kg-m/sec |
| (c) 3.456 × 20–25 kg-m/sec | (d) 3.313 × 10–22 kg-m/sec |
In a Young's double slit experiment the source S and the two slits A and B are vertical with slit A above slit B. The fringes are observed on a vertical screen K. The optical path length from S to B is increased very slightly (by introducing a transparent material of higher refractive index) and the optical path length from S to A is not changed, as a result the fringe system on K moves
|
(a) Vertically downwards slightly |
(b) Vertically upwards slightly |
|
(c) Horizontally, slightly to the left |
(d) Horizontally, slightly to the right |
When hydrogen atom is in its first excited level, its radius is .... its ground state radius
|
(a) Half |
(b) Same |
(c) Twice |
(d) Four times |
In Young's experiment, light of wavelength 4000 Å is used to produce bright fringes of width 0.6 mm, at a distance of 2 meters. If the whole apparatus is dipped in a liquid of refractive index 1.5, then fringe width will be
|
(a) 0.2 mm |
(b) 0.3 mm |
(c) 0.4 mm |
(d) 1.2 mm |
$\text{I}_0$
$\frac{\text{I}_0}{4}$
$\frac{\text{I}_0}{2}$
$4\text{I}_0$
A magnet of magnetic moment M is rotated through 360° in a magnetic field H, the work done will be
| (a) MH | (b) 2MH | (c) 2πMH | (d) Zero |