IIT-JEE Exam

Young’s double slit experiment is carried out by using green, red and blue light, one color at time. The fringe
widths recorded are G, R and B, respectively. Then
(A) G > B > R (B)B > G > R (C)R > B > G (D)R > G > B

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IIT-JEE Other Question
A small massm is attached to amassless string whose other end is fixed at P as shown in the figure. Themass
is undergoing circular motion is the x-y plane with centre at O and constant angular speed . If the angular
momentum of the system, calculated about O and P are denoted by O L

and P L

respectively, then A person blows into open-end of a long pipe. As a result, a high-pressure pulse of air travels down the pipe.
When this pulse reaches the other end of the pipe.
(A) a high-pressure pulse starts traveling up the pipe, if the other end of the pipe is open.
(B) a low-pressure pulse starts traveling up the pipe, if the other end of the pipe is open.
(C) a low-pressure pulse starts traveling up the pipe, if the other end of the pipe is closed.
(D) a high-pressure pulse starts traveling up the pipe, if the other end of the pipe is closed.