Redefining the Kilogram

Redefining the Kilogram

Assessment

Interactive Video

Physics, Chemistry, Science

10th Grade - University

Hard

Created by

Sophia Harris

FREE Resource

The video explores the redefinition of the kilogram, which has been traditionally defined by a physical object in Paris. Due to discrepancies in mass measurements, a new definition based on Planck's constant is being developed. The video explains the Kibble balance, a device used to measure Planck's constant with high precision, and discusses the role of quantum effects in this process. The redefinition aims to provide a more stable and universal standard for mass measurement.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why is the current definition of the kilogram considered problematic?

It is based on a physical object that can change over time.

It is too complex to understand.

It is not recognized internationally.

It is based on outdated technology.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the main goal of redefining the kilogram?

To make it easier to measure.

To reduce its weight.

To base it on a constant of nature.

To align it with the meter.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which two methods were primarily considered for redefining the kilogram?

Using a silicon sphere and a Kibble balance.

Using a platinum bar and a silicon sphere.

Using a Kibble balance and a platinum bar.

Using a silicon sphere and a gold bar.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the Kibble balance used to measure?

The gravitational constant.

Planck's constant.

The speed of light.

Avogadro's number.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the Kibble balance, what are the two modes of operation?

Weighing mode and velocity mode.

Current mode and voltage mode.

Magnetic mode and electric mode.

Static mode and dynamic mode.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is voltage measured accurately in the Kibble balance?

Using a laser interferometer.

Using Josephson junctions.

Using a gravimeter.

Using a voltmeter.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What quantum effect is used to measure resistance in the Kibble balance?

Quantum Hall effect.

Quantum superposition.

Quantum entanglement.

Quantum tunneling.

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