Question

Which of the following metal is used for the atomic standard of time?
1. Uranium
2. Cesium
3. Calcium
4. Aluminum

Answer 1

Correct Answer - Option 2 : Cesium

CONCEPT:

• Time standard: It is a specification for measuring time.
  • It can be classified as the rate at which time passes.
  • At the present time, We use an atomic standard of time.
  • The periodic vibrations produced in a cesium atom are the basis for the atomic standard of time.

EXPLANATION:

• At the present time, We use an atomic standard of time.
• Hence the periodic vibrations produced in a cesium atom" are the basis for the atomic standard of time.
• So the correct answer is option 2.