By Kumar Manoj

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714 m] A tunning fork frequency 284 Hz is emitting sound waves of velocity 330 m/sec in air. Find the wavelength of waves emitted. 5 cm. \56\ Applied Physics-II [Ans. I X 1O-2 m ] 10. 5 xl 010 N/m 2 . II. [Ans. 00 I m is at resonance. 9x 101oN/m 2 and f = 2650 Kg/m3. [ Ans. 73 Hz] 12. 7x 103 Kg/m3 and bulk modulus [Ans. ] ANSWER KEY FOR MULTIPLE CHOICE QUESTIONS (1) (6) (11) c c a (2) (7) (12) c b b (16) d (17) b (3) (8) (13) b b b (4) (9) (14) d c c (5) (10) (15) d a c \57\ UNIT - 3 PRINCIPLE OF OPTICS INTRODUCTION :Optics is the branch of Physics which deals with the study of optical phenomena" like reflection, refraction, dispersion, interference, differaction etc.

Ans. M of amplitude 10-2 m . Its velocity while passes through equilibrium is 10m/sec. Find its frequency. 4. [Ans. M of amplitude 1 cm and time period 4 sec. 5. [Ans. M. in a line 4 cm long. Its velocity when passes through the centre of the line is 12 cm/sec. Find the time period. 7r [Ans. " Upto 19th century there was no consideration of sound effects in the halls, auditorium etc. All the buildings such as cinema halls, theatres etc. were found to have unsatisfactory sound means, as there was huge dearth of knowledge on accoustics.

5) (iv) ECHELON EFFECT :When a sharp sound is produced in front of the foot steps near a staircase, a musical sound is produced due to regular series of reflected sound, each consisting of a simple echo of the original sound. This is known as Echelon effect. This can be avoided by covering the stair case with carpets to avoid refection of sound. By using upholding chairs in the halls we can control the quality af sound as upholding chairs are good absorber and reduce reverberaion time. (vi) ECHO:An echo is the repetition of the original sound from a source by reflection from some object.