Related InterviewSolutions

• The slit width, when a light of wavelenght 6500Å is incident on a slit, if first minima for red light is at `30^(@)` isA. `1xx10^(-6) cm`B. `5.2xx10^(-6) cm`C. `1.3xx10^(-6) cm`D. `2.6xx10^(-6) cm`
• Two stars distance two light yers are just resolved by a telescope. The wavelenght of light used in is `0.25`m. If the wavelenght of light used in `5000Å` then the minimum distance between the stars isA. `1.22xx10^(11)m`B. `22.44 xx10^(11)m`C. `3.66xx10^(11)m`D. `4.88xx10^(11)m`
• Two stars are situated at a distance of 8 light years from the earth. These are to be just resolved by a telescope of diameter 0.25 m. If the wavelength of light used is 5000 Å, then the distance between the stars must beA. `3 xx10^(10) m`B. `3.35 xx10^(11) m`C. `1.35 xx10^(11) m`D. `4.32 xx10^(10) m`
• The distance between the first and the sixth minima in the diffraction pattern of a single slit is 0.5 mm. The screen is 0.5 m away from the slit. If the wavelength of light used is 5000 Å. Then the slit width will beA. `2.5mm`B. `5 mm`C. `1.25 mm`D. `1 mm`
• A double slit experiment is performed with light of wavelength `500nm`. A thin film of thickness `2mum` and refractive index `1.5` is introduced in the path of the upper beam. The location of the central maximum willA. remains unshiftedB. shift downward by nearly two fringesC. shift upwards by nearly two fringesD. shift downward by 10 fringes
• Lights of wavelengths `lambda_(1)=4500 Å, lambda_(2)=6000 Å` are sent through a double slit arrangement simultaneously. ThenA. no interference pattern will be formedB. the thrid bright fringe of `lambda_(1)` will coincide with the fourth bright fringe of `lambda_(2)`C. the thrid bright fringe of `lambda_(2)` will coincide with the fourth bright fringe of `lambda_(1)`D. the fringes of wavelenths `lambda_(1)` will bw wider than the fringes of wavelenghts `lambda_(2)`
• In double slit experiment, the angular width of the fringes is `0.20^@` for the sodium light `(lambda=5890Å)`. In order to increase the angular width of the fringes by `10%`, the necessary change in the wavelength isA. increased of `589 Å`B. decreases of `589 Å`C. increases of `6479 Å`D. 0
• A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statements is correct?A. the angular width of the central maximum of the diffraction pattern will increasesB. the angular width of the central maximum of the diffraction pattern will decreaseC. the angular width of the central maximum will decreaseD. diffraction pattern is not observed on the screen in the case of electrons
• In a biprism expeirment , the distance between the slit and the biprism is 20 cm and the distance between the biprism and focal and plane of the epyepiece is 80 cm. Whith the separation between two virtual images of the slit seperation between two virtual images of the slit is 0.4 cm, an interfence pattern is obtained with a light of wavelength `5500Å` .The distance between the third and eighth bands on the same side of the central bright band isA. `1.68 mm`B. `3.68 mm`C. `2.68mm`D. `0.68` mm
• In a two slit experiment with monochromatic light fringes are obtained on a screen placed at some distance from the sits. If the screen is moved by m `5 xx 10^(-2)m` towards the slits, the change in fringe width is m `3 xx 10^(-5)m` . If separation between the slits is `10^(-3)m` , the wavelength of light used isA. `6000Å`B. `5000Å`C. `3000Å`D. `45000Å`