Understanding the Redefinition of SI Units

Understanding the Redefinition of SI Units

Assessment

Interactive Video

Physics, Chemistry, Science

10th Grade - University

Hard

Created by

Sophia Harris

FREE Resource

The video discusses the redefinition of four SI units, including the kilogram, to be based on fundamental constants rather than physical objects. The kilogram, previously defined by a metal cylinder, will now be defined using Planck's constant. This change aims to eliminate uncertainties and improve measurement precision. The video also explains the impact on other units like the mole, ampere, and Kelvin, and highlights the importance of accurate measurements in scientific progress.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the main reason for redefining the kilogram?

To make it lighter

To base it on a fundamental constant

To change its shape

To make it heavier

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What constant is used to redefine the kilogram?

Gravitational constant

Planck's constant

Boltzmann constant

Avogadro's constant

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which method is NOT used to measure Planck's constant?

Silicon sphere

Watt balance

Pendulum swing

Electromagnetic force

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the main challenge in fixing the value of Planck's constant?

Making it heavier

Finding a new physical object to base it on

Reducing its value

Ensuring it is consistent with current measurements

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How will the redefinition of the kilogram affect the mole?

It will decrease the mole's value

It will make the mole obsolete

It will increase the mole's value

It will fix Avogadro's constant

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What will the ampere be based on after the redefinition?

The temperature of water

The speed of light

The charge of an electron

The mass of a kilogram

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the relationship between Planck's constant and Avogadro's constant?

They are directly related

They are the same

They are inversely related

They are unrelated

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