Huygens' wave theory allows us to know the:
1. | Wavelength of the wave. |
2. | Velocity of the wave. |
3. | Amplitude of the wave. |
4. | Propagation of wavefront. |
In YDSE, an electron beam is used to obtain an interference pattern. If the speed of electrons is increased:
1. | No interference pattern will be observed. |
2. | Distance between two consecutive fringes remains the same. |
3. | Distance between two consecutive fringes will decrease. |
4. | Distance between two consecutive fringes will increase. |
Huygen's principle for secondary wavelets may be used to:
1. | explain Snell's law. |
2. | find the velocity of light in vacuum. |
3. | find a new position of a wavefront. |
4. | both (1) & (3) are correct. |
A beam of unpolarized light of intensity is passed first through a tourmaline crystal A and then through another tourmaline crystal B oriented so that its principal plane is parallel to that of A. The intensity of the final emergent light is I. The value of I is:
1.
2.
3.
4.
Two coherent sources are 0.3 mm apart. They are 1 m away from the screen. The second dark fringe is at a distance of 0.3 cm from the center. The distance of the fourth bright fringe from the centre is:
1. 0.6 cm
2. 0.8 cm
3. 1.2 cm
4. 0.12 cm
If the ratio of amplitudes of two coherent sources producing an interference pattern is 3 : 4, the ratio of intensities at maxima and minima is:
1. 3 : 4
2. 9 : 16
3. 49 : 1
4. 25 : 7
Young's double-slit experiment is performed in a liquid. The 10th bright fringe in the liquid lies where the 8th dark fringe lies in a vacuum. Refractive index of the liquid is approximately:
1. 1.81
2. 1.67
3. 1.54
4. 1.33
If the 5th order maxima of wavelength 4000 in Young's double-slit experiment coincides with the nth order maxima of wavelength 5000 , then n is equal to:
1. 5
2. 8
3. 4
4. 10
Two waves, each of intensity \(i_{0}\)
1. \(2i_{0}\)
2. \(i_{0}\)
3. \(i_{0}/2\)
4. zero
Four coherent sources of intensity \(I\) are superimposed constructively at a point. The intensity at that point is:
1. \(4I\)
2. \(8I\)
3. \(16I\)
4. \(24I\)