Interference MCQ Quiz in తెలుగు - Objective Question with Answer for Interference - ముఫ్త్ [PDF] డౌన్లోడ్ కరెన్
Last updated on Mar 22, 2025
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Interference Question 1:
Comprehension:
The British physicist Thomas used an ingenious technique to lock the phases of the waves emanating from two coherent sources S1 and S2. As these sources were derived from same source symmetrically placed wrt S1 and S2, the phases of waves were same. If any abrupt change happens in original sources, will manifest exactly similar phase changes in the light coming out of two sources S1 to S2. Due to constructive interference and destructive interference at different points in space and screen alternate dark and bright fringes of equal width were obtained. This pattern was called as interference pattern. The width of each band was equal with central fringe as bright fringe.
In Young's double slit experiment, interference pattern is obtained on the screen. If one of the slits is closed, then :
Answer (Detailed Solution Below)
Interference Question 1 Detailed Solution
Explanation:
- In Young's double-slit experiment, when both slits are open, light passing through the two slits creates an interference pattern on the screen with bright and dark fringes. However, when one of the slits is closed, the interference pattern disappears, and only a diffraction pattern is obtained on the screen.
- The diffraction pattern obtained when one of the slits is closed is due to the bending of light as it passes through the open slit.
- The light spreads out, creating a wider central maximum and a series of secondary maxima and minima on either side. The intensity of the central maximum decreases because the light from only one slit is contributing to it, while the intensity of the secondary maxima and minima increases because the light from one slit is focused into a narrower region.
- If one of the slits is closed in Young's double-slit experiment, the interference pattern disappears, and only a diffraction pattern is obtained on the screen.
- The width of the central maximum increases, and the intensity of the central maximum decreases while the intensity of the secondary maxima and minima increases.
The correct answer is option "3"
Interference Question 2:
Comprehension:
The British physicist Thomas used an ingenious technique to lock the phases of the waves emanating from two coherent sources S1 and S2. As these sources were derived from same source symmetrically placed wrt S1 and S2, the phases of waves were same. If any abrupt change happens in original sources, will manifest exactly similar phase changes in the light coming out of two sources S1 to S2. Due to constructive interference and destructive interference at different points in space and screen alternate dark and bright fringes of equal width were obtained. This pattern was called as interference pattern. The width of each band was equal with central fringe as bright fringe.
If two sources of intensities I0 each have a randomly varying phase difference ϕ, the resultant intensity at centre of screen will be :
Answer (Detailed Solution Below)
Interference Question 2 Detailed Solution
Explanation:
When two sources of intensities Io interfere, the resultant intensity depends on the phase difference ϕ between the two sources.
For all other values of ϕ, the resultant intensity is given by:
I = 4Io cos²(ϕ/2)
Since the phase difference ϕ is randomly varying, we need to take the average of the above equation over all possible values of ϕ. The average value of cos²(ϕ/2) over all possible values of ϕ is 1/2.
Therefore, the average value of I is:
I = 4Io × 1/2 = 2Io
we will observe an average intensity that will be given by I = 2 Io at all points.
So, the resultant intensity at the centre of the screen is 2Io
The correct answer is option "3"