37. 2075 Set A Q. No. 11 What is the difference between the speed of longitudinal waves in air at 27°C and at - 13°C?
What is the speed at 0°C?
[4]​

Shy diving is the only sport which doesnot require a high level of physical fitness

The answer is 4f======since electrostatic force is given by    we let f be the electrostatic force when  r = 1 m    if we let  denote the electrostatic force when the distance is decreased so that r = 0.5m, then    we established earlier that f = kq₁q₂. therefore    the force will now be 4f.

We have no idea what the graph shows, or why it may be accurate,  because we can't see the graph.on a different subject, choice ' d ' is the only true statement among the choices.