(i) (a) Name the waves used in SONAR.
(b)

In the above diagram Lata stands between two cliffs and claps her hands Determine the time taken by her to hear the first echo.
Speed of sound in alr 320 ms^-1.

(ii) (a) Complete the following radioactive reaction:



(b) Uranium is available in two forms U-235 and U-238. Which of the two isotopes of Uranium is more fissionable?

(iii) In the given diagram, a vibrating tuning fork is kept near the mouth of a burette filled with water. The length of the air column is adjusted by opening the tap of the burette. At a length of 5 cm of the air column, a loud sound is heard.



(a) Name the phenomenon illustrated by the above experiment.
(b) Why is a loud sound heard at this particular length?
(c) Ifthe present tuning fork is replaced with a tuning fork of higher frequency, should the length of the air column increase or decrease to produce a loud sound? Give a reason.

Solution

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