253. Newton"s formula for the velocity of sound is wrong because of his
   consideration about the propagation of sound as :
   (a) an isothermal process
   (b) an adiabatic process
   (d) Both of these
   (e) None of these
Ans: (a)
254. Laplace made a correction in the basic formula of velocity of sound given
   by Newton and evaluated the correct value by considering that sound
   propagation is:
   (a) an isothermal process
   (b) an adiabatic process
   (c) both of these
   (d) none of these
Ans: (b)
255. In the formation of a stationary wave which one of the following process
   does not occur:
   (a) energy transmits from one place to another
   (b) energy remains confined within the space
   (c) nodes and antinodes form consecutively
   (d) None of these
Ans: (a)
256. Which one of the following is true about the stationary wave:
   (a) it is formed by the superposition of two equal and opposite plane
       progressive waves
   (b) it is formed by the superposition of two equal and of the same direction
       plane progressive wave propagation
   (c) any of the above
   (d) None of these
Ans: (a)
257. Open organ pipes (air columns) are sweater than closed organ pipes
   because:
                                       195