25 Reflection of sound obeys the law (a) Zr (b) (c) Zr d) none of the above 26 To observe and compare p exerted by solid iron cuboid student the cuboid gently on the loose sand and student Y placed it on face on the surface of a table. The the same pressure exerted is easily observed by (a) Student x only (b) Student Y only (c) Both x and Y (d) Neither X or Y 27 The formula which will be used to find velocity of pulse in a string, where v velocity of pulse, l distance travelled by pulse in the string and t-time to travel length Both (a) and (b) (a)



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