Come on goiitians, try it!!!!!!!!

SALUTES ASSURED.

Q. A certain loudspeaker(ssumed to be a point source) emits 30 W of sound power. A small microphone of effective cross-sectional area 0.75 cm² is located 200 m from the loudspeaker such that surface of microphone is in normal direction to wave propagation.Calculate:

 (a)the sound intensity at microphone,

 (b)the power received by the microphone.

Q. The most favourable conditions for a real gas to liquefy are:

      a)low T,low P 

      b)lowT,highP 

      c)highT,lowP  

      d)highT,highP

Angle A is obtuse. Find the value of sin³A-cos³A   -   cosA

                                                    ------------------      ----------

                                                     sinA-cosA        (1+cos²A)^0.5

Q.     -k<=cos{sin+ (sin²+sin²)^0.5}<=k for all values of theta.

        Prove that k={1+sin²⁽gamma)}^0.5

   

Is the answer  {v² - 2gr(1-cos)}sin

                       ---------------------

                                r