The pressure at the summit of a syphon is A. equal to atmospheric B. less than atmospheric C. more than atmospheric D. none of the above

The correct answer is B. less than atmospheric.

A siphon is a device used to transfer liquids from one container to another, using the principle of atmospheric pressure. The siphon works by creating a partial vacuum at the top of the tube, which draws the liquid up the tube and out of the container. The pressure at the summit of a siphon is less than atmospheric pressure because the liquid is being pulled up the tube by the vacuum.

Option A is incorrect because the pressure at the

summit of a siphon is not equal to atmospheric pressure.

Option C is incorrect because the pressure at the summit of a siphon is not more than atmospheric pressure.

Option D is incorrect because the pressure at the summit of a siphon is not none of the above.