Time is now precisely measured with primary standard clocks that are based on
A)very precise pendulum motion.
B)the first appearance of ground hogs on Ground Hog day.
C)the vibration of cesium atoms.
D)the pulse rate of pulsar stars.
E)the speed of light.

Question

Quizplus · Accepted Answer

The current primary standard for measuring time is the atomic clock, which measures time based on the vibrations of cesium atoms. This method is incredibly precise and accurate, allowing for accurate measurements of time that are essential for many scientific and technological applications. Other options, such as pendulum motion and pulsar stars, have been used in the past, but they are not as accurate or reliable as atomic clocks.

Time Is Now Precisely Measured with Primary Standard Clocks That