## Wave Optics Quiz-9

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background.

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced.

Q81. Two coherent sources of intensity ratio 1:4 produce an interference pattern. The fringe visibility will be
•  1
•  0.8
•  0.4
•  0.6
Solution

Q82.A single slit is used to observe diffraction pattern with red light. On replacing the red light with violet light the diffraction pattern would
•  Remain unchanged
•  Become narrower
•  Disappear
Solution
In diffraction pattern, fringe width is proportional to Î». We know that wavelength of violet light is less than that of red light, so on replacing red light with violet light, diffraction pattern would become narrower.

Q83.  Unpolarised light falls on two polarizing sheets placed one on top of the other. What must be the angle between the characteristic directions of the sheets if the intensity of the final transmitted light is one-third the maximum intensity of the first transmitted beam
•  75°
•  55°
•  35°
•  15°
Solution

Q84. The idea of the quantum nature of light has emerged in an attempt to explain
•  Interference
•  Diffraction
•  Radiation spectrum of a black body
•  Polarization
Solution
According to Plancks hypothesis, black bodies emit radiations in the form of photons

Q85.A new system of units is evolved in which the values of Î¼0 and Ïµ0= are 2 and 8 respectively. Then the speed of light in this system will be
•  0.25
•  0.5
•  0.75
•  1
Solution

Q86. In Young’s double slit experiment, the 8th maximum with wavelength Î»1 is at a distance d1 from the central maximum and the 6th maximum with a wavelength Î»2 is at a distance d2. Then (d1/d2) is equal to

•

•

Solution

Q87.In Young’s double slit experiment, the distance between the two slits is made half, then the fringe width will become
•  Half
•  Double
•  One fourth
•  Unchanged
Solution
Î²∝1/d

Q88.The phenomenon which does not take place in sound waves is
•  Scattering
•  Diffraction
•  Interference
•  Polarisation
Solution
As sound waves are longitudinal, therefore, polarization of sound waves is not possible.

Q89.A mixture of light, consisting of wavelength 590 nm and an unknown wavelength, illuminates Young’s double slit and gives rise to two overlapping interference patterns on the screen. The central maximum of both lights coincide. Further, it is observed that the third bright fringe of known light coincides with the 4th bright fringe of unknown light. From this data, the wavelength of the unknown light is
•  393.4 nm
•  885.0 nm
•  442.5 nm
•  776.8 nm
Solution
n1 Î»1=n2 Î»2⇒3×590=4×Î»2⇒Î»=442.5nm

Q90. In an interference experiment, third bright fringes are obtained at a point on the screen with a light of 700 nm. What should be the wavelength of the light source in order to obtain 5th bright fringe at the same point?
•  630
•  500
•  450
• 750
Solution

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