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When two different materials, and having atomic numbers, and are used as the target in Coolidge -ray tube at different operating voltage, and , respectively, their spectrums are found as below.

The correct relation is

The correct relation is
(a) and
(b) and
(c) and
(d) and

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Important Questions on Atomic Physics
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A student is jogging on a straight path with the speed per hour. Perpendicular to the path is kept a pipe with its opening from the road (see figure). Diameter of the pipe is At the other end of the pipe is a speaker emitting sound of towards the opening of the pipes. As the student passes in front of the pipe, she hears the speaker sound for seconds. is in the range (take speed of sound, ):

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