Wave Optics Tes...

Air has refractive index 1.0003. The thickness of air column, which will. have one more wavelength of yellow light (6000 Å) than in the same thickness of vacuum is

A beam of electron is used in an YDSE experiment. The slit width is d. When the velocity of electron is increased, then

In Young\'s double slit experiment intensity at a point is (1/4) of the maximum intensity. Angular position of this point is

Figure here shows P and Q as two equally intense coherent sources emitting radiations of wavelength 20 m. The separation PQ is 5.0 m and phase of P is ahead of the phase of Q by 90°. A, B and C are three distant points of observation equidistant from the mid-point of PQ. The intensity of radiations at A, B, C will bear the ratio

In Young\'s double slit experiment, the intensity on the screen at a point where path difference λ is K. What will be the intensity at the point where path difference is λ / 4

When one of the slits of Young\'s experiment is covered with a transparent sheet of thickness 4.8 mm, the central fringe shifts to a position originally occupied by the 30th bright fringe. What should be the thickness of the sheet if the central fringe has to shift to the position occupied by 20th bright fringe

In the ideal double-slit experiment, when a glass-plate (refractive index 1.5) of thickness t is introduced in the path of one of the interfering beams (wavelength λ), the intensity at the position where the central maximum occurred previously remains unchanged. The minimum thickness of the glass-plate is

The time period of rotation of the sun is 25 days and its radius is 7 × 10⁸ m. The Doppler shift for the light of wavelength 6000 Å emitted from the surface of the sun will be

In hydrogen spectrum the wavelength of H_α line is 656 nm whereas in the spectrum of a distant galaxy, H_α line wavelength is 706 nm. Estimated speed of the galaxy with respect to earth is

The periodic time of rotation of a certain star is 22 days and its radius is 7 × 10⁸ metres. if the wavelength of light emitted by its surface be 4320 Å, the Doppler shift will be (1 day = 86400 sec)