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Why does the size of the needle of a syringe control flow rate better than the thumb pressure exerted by a doctor while administering an injection?

Options

  1. ABecause thumb pressure directly affects pressure and velocity equally.
  2. BBecause the pressure exerted by the doctor depends solely on thumb strength.
  3. CBecause the size of the needle affects the velocity squared, giving it a more significant influence on flow ra
  4. DBecause the thumb pressure exerted by a doctor can be precisely measured and controlled.

Correct answer

C. Because the size of the needle affects the velocity squared, giving it a more significant influence on flow ra

Step-by-step solution

Correct Option is : (C) Because the size of the needle affects the velocity squared, giving it a more significant influence on flow rate.

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