(i) What is a continuous emission spectrum? Name one source of light which produces such a spectrum.
(ii) Explain in brief why dark lines are observed in the solar spectrum.
(i) What are coherent sources?
(ii) In young’s double slit experiment, what is the path differences between the two light waves forming 5th bright band (fringe) on the screen?
(i) In case of polarized light, what is means by the plane of polarization?
(ii) Find refractive index of glass if its polarising angle is 60°.
(i)Explain the statement: “Angular magnification of a compound microscope in normal use is 30”.
(ii) State how the resolving power of an astronomical telescope can be increased.
In Millikan’s oil drop experiment, the two plates are 2 cm apart. When a potential differences of 2355 V is applied between them, an oil drop of radius 1μm is found to remain suspended. Calculate the number of excess electrons on the drop,
[Density of oil = 900 kg/m 3 = Density of air may be ignored]
The 40000 volt (P2)supply is connected across the x-ray tube where as P1 supply of 6 volt is connected across the Filament F. The positive end of the P2 supply is connected to target
T and negative end of P2 is connected to one of the terminal of filament F.
The negative end of the P1 is connected to that terminal of the filament where the P2 is connected and positive end of the P1 is connected to the other terminal of the filament.