2.
Physics 2019
In a double slit experiment,when light of wavelength 400 nm was used,the angular width of the first minima formed on a screen placed 1 m away,was found to be 0.2°.What will be the angular width of the first minima,if the entire experimental apparatus is immersed in water?
(μ water = $$\frac{4}{3} $$
3.
Physics 2019
.
lonized hydrogen atoms and α -particles with same momenta enters perpendicular to a constant magnetic field, B.The ratio of their radii of their paths rH:rα will be:
4.
Physics 2019
When a block of mass M is suspended by a long wire of length L,the length of the wire becomes (L+l).The elastic potential energy stored in the extended
5.
Physics 2019
In which of the following devices,the eddy current effect is not used?
6.
Physics 2019
Body A of mass 4m moving with speed u collides with another body B of mass 2m,at rest.The collision is head on and elastic in nature.After the collision the fraction of energy lost by the colliding body A is:
7.
Physics 2019
A mass m is attached to a thin wire and whirled in a vertical circle.The wire is most likely to break when:
