10 Questions
Which element is used in atomic clocks to measure time?
Caesium
What is the basis for the International System of Units' definition of a second?
The frequency of electromagnetic radiation
What is the SI unit of time?
Second
What is the numerical value of the caesium frequency used to define a second?
9192631770 Hz
Which phenomenon serves as the basis for the International System of Units' definition of a second?
Transitions between different energy levels in an atom
What is the system of atomic clocks around the world called?
International Atomic Time (TAI)
What is the SI unit of time?
Second
What is the basis for the system of International Atomic Time (TAI)?
The definition of a second
What is the system of Coordinated Universal Time (UTC) based on?
The definition of a second
What is the role of atomic clocks in measuring time?
Monitoring the resonant frequency of atoms
Study Notes
Atomic Clocks and Time Measurement
- Caesium is the element used in atomic clocks to measure time.
- The basis for the International System of Units' definition of a second is the caesium frequency.
- The SI unit of time is the second.
- The numerical value of the caesium frequency used to define a second is 9,192,631,770 Hz.
- The phenomenon that serves as the basis for the International System of Units' definition of a second is the energy transition of caesium-133 atoms.
- The system of atomic clocks around the world is called International Atomic Time (TAI).
- The system of Coordinated Universal Time (UTC) is based on International Atomic Time (TAI).
- The role of atomic clocks is to provide a precise and consistent way of measuring time.
Test your knowledge about atomic clocks and the International System of Units (SI) in this quiz. Learn about the resonant frequency of atoms and how it is used to measure time accurately.
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