Podcast
Questions and Answers
What is the volume of the platinum and iridium cylinder used to define the kilogram?
What is the volume of the platinum and iridium cylinder used to define the kilogram?
- 10 cm³
- 1,000 cm³ (correct)
- 10,000 cm³
- 1 cm³
Which of the following statements accurately describes the current definition of the kilogram?
Which of the following statements accurately describes the current definition of the kilogram?
- It is defined by the gravitational force exerted on a specific object at a specific location.
- It is defined by the mass of a specific volume of water.
- It is defined as the mass of one liter of pure water at 4°C.
- It is defined by a metal cylinder of platinum and iridium. (correct)
What is the current definition of the second?
What is the current definition of the second?
- It is defined by the time it takes light to travel a specific distance in a vacuum.
- It is defined by the frequency of the radiation associated with an atomic transition of Cesium-133. (correct)
- It is defined as 1/86400 of the mean solar day.
- It is defined as the time it takes for the Earth to complete one rotation.
Which of the following is NOT a base quantity?
Which of the following is NOT a base quantity?
What is the frequency of the radiation associated with the atomic transition of Cesium-133 that defines the second?
What is the frequency of the radiation associated with the atomic transition of Cesium-133 that defines the second?
Flashcards
Mass
Mass
Mass is the base quantity describing the amount of substance.
Kilogram Definition
Kilogram Definition
A kilogram is now defined by a metal cylinder of platinum and iridium.
Platinum-Iridium Cylinder
Platinum-Iridium Cylinder
The cylinder defining a kilogram is a cube with sides of 0.10 m (10 cm).
Time
Time
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Second Definition
Second Definition
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