Arrange the following steps in a sequential order to verify the laws of reflection.
(A) A hard , smooth surface (AB) is mounted vertically over a horizontal board on which two tubes P and Q , point towards the surface AB.
(B) The tube Q is adjusted such that the listener would be able to hear the ticking sound clearly at the end away from AB.
(C) The sound waves from a source , like ticking clock are directed to the surface AB through the pipe P inclined at an angle to AB .
(D) By measuring the angles the tubes make with the surface AB , the laws of reflection are verified .

Options

A. ABCDEF
B. ABEDCF
C. FCADBE
D. DEABCF

Answer

A

Explanation

(i) Mount a smooth and hard wooden plank vertically on the surface of a table and clamp two pipes P and Q inclined at certain angles on the table. (ii) Place a ticking clock .S. closer to the pipe .P.. (iii) Now keep your ear to the open end of Q and adjust the position of Q to listen to the ticking sound. (iv) Measure the angle made by the two pipes with the normal. (v) Repeat the experiment by changing the inclination of P and correspondingly, the inclination of (vi) Measure the angles in each case and you find the sound which is incident and reflected from the wooden plank makes equal angle with the normal.