Half-life

Half-life

9th - 10th Grade

9 Qs

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Half-life

Half-life

Assessment

Quiz

Science

9th - 10th Grade

Practice Problem

Medium

Created by

Chris Hawkins

Used 8+ times

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9 questions

Show all answers

1.

FILL IN THE BLANK QUESTION

1 min • 1 pt

Technetium's atomic number is

2.

FILL IN THE BLANK QUESTION

1 min • 1 pt

How many neutrons would Technetium-99 have?

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Technetium-99 undergoes beta decay, meaning when it transmutes, it emits

high-energy electromagnetic radiation

a proton

an electron

a helium nucleus

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

When Technetium-99 transmutates, its nuclei would turn into

Technetium-98 nuclei

Technetium-100 nuclei

Ruthenium-98 nuclei

Ruthenium-99 nuclei

5.

FILL IN THE BLANK QUESTION

1 min • 1 pt

Technetium-99 has a half-life of 6 hours. How much of a 0.5g sample of technetium-99 would remain after it has been undergoing radioactive decay for 24 hours? _____ g (rounded to 2 d.p.)

6.

FILL IN THE BLANK QUESTION

2 mins • 1 pt

Suppose you leave a 0.2g sample of technetium-99 in a cupboard overnight. Technetium transmutates into ruthenium. How long would the sample of technetium have been left in the cupboard for, if there was 0.175g of ruthenium present the next day? ______ hours

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Smoke detectors contain radioactive americium. The americium emits an alpha particle when it transmutates. Alpha particles are

positively-charged

negatively-charged

not charged, because they are pure energy

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