ISC (Science) ISC Class 12 - CISCE Question Bank Solutions

Name the series in the atomic spectra of the hydrogen atom that falls in the ultra violet region. 

When a beam of white light is passed through sodium vapors and then through a spectrometer, spectrum so obtained has two dark lines present in the yellow region. This spectrum is called:

What is meant by an equipotential surface?

Name the series of lines of hydrogen spectrum which lie in the ultraviolet region.

Name the series of lines of hydrogen spectrum which lie in the visible region.

In Young’s double slit experiment, show graphically how the intensity of light varies with distance

What should be the path difference between two waves reaching a point for obtaining constructive interference in Young’s Double Slit experiment ?

Draw a neat labelled diagram of Young’s Double Slit experiment. Show that `beta = (lambdaD)/d` , where the terms have their usual meanings (either for bright or dark fringe).

How is the fringe width of an interference pattern in Young's double-slit experiment affected if the two slits are brought closer to each other?

In Young's double slit experiment using monochromatic light of wavelength 600 nm, 5^th bright fringe is at a distance of 0·48 mm from the centre of the pattern. If the screen is at a distance of 80 cm from the plane of the two slits, calculate:
(i) Distance between the two slits.
(ii) Fringe width, i.e. fringe separation.

In Young’s double-slit experiment, using monochromatic light, fringes are obtained on a screen placed at some distance from the slits. If the screen is moved by 5 x 10^-2 m towards the slits, the change in the fringe width is 3 x 10^-5 m. If the distance between the two slits is 10-3 m, calculate the wavelength of the light used.

In Young’s double-slit experiment, show that: 

`beta = (lambda "D")/"d"` where the terms have their usual meaning.

In Young’s double slit experiment, what is the effect on fringe pattern if the slits are brought closer to each other?

In Young’s double slit experiment, what should be the phase difference between the two overlapping waves to obtain 5th dark band/fringe on the screen?

Read the passage given below and answer the questions that follow.

1. What is the cause of energy generation of a nuclear reactor during nuclear fission?
2. Write one nuclear reaction for nuclear fission that takes place in a nuclear reactor.
3. Give the formula for the energy generation that takes place in the nuclear reactor.

In Young's double slit experiment the slits are 0.589 mm apart and the interference is observed on a screen placed at a distance of 100 cm from the slits. It is found that the 9th bright fringe is at a distance of 7.5 mm from the dark fringe which is second from the center of the fringe pattern. Find the wavelength of the light used.

Name the type of nuclear reaction that takes place in the core of the Sun.

In Young's double slit experiment, the distance of the 4^th bright fringe from the centre of the interference pattern is 1.5 mm. The distance between the slits and the screen is 1.5 m, and the wavelength of light used is 500 nm. Calculate the distance between the two slits.

In a nuclear reactor, state the use of graphite rods.

In a nuclear reactor, state the use of cadmium rods.