LLT414 – Quiz Portal

LLT414

Welcome to LLT414!

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“The only way of discovering the limits of the possible is to venture a little way past them into the impossible.",
Arthur C. Clarke - @harauenglish

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Let's play the talk!

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1. What is the main topic of this lecture?

Geological formations.

Popcorn.

Radiometric dating.

Carbon-14.

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2. What is the definition of a half-life?

Half an hour for an individual nucleus to decay.

Half of the carbon present in a living organism.

Half the time it takes for a group to decay.

The average time it takes for half of a group to decay.

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3. Why does the professor mention popcorn?

Because he is using popcorn in a laboratory demonstration.

Because it was an example in the textbook.

Because popcorn is a carbon-based life form.

Because popcorn is a good analogy for half-lives.

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4. What do we know about carbon-14?

It has a half-life of almost 50 billion years.

It represents most of the carbon in living things.

It is used to estimate the age of carbon-based life forms.

It is the only accurate isotope for radiometric dating.

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5. Listen again to part of the lecture. Then answer the question.

"So what about rocks that are millions or even billions of years old? Well, the same process can be applied, but we have to use istopes that have longer half-lives."

Why does the profes or ask this question: "So what about rocks that are millions or even billions of years old?"

He is probing to see whether the students have understood the lecture so far.

He is expressing doubt about the concept that he has been discussing.

He is preparing to suggest an answer to the question that he has just asked.

He is trying to encourage the students to answer a difficult question.

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6. Which of the following would NOT be dated using carbon-14?

A dead tree.

An animal skull.

A fossilized shellfish.

A giant crystal.

Let's see the result. Learning together, supporting each other!