Free Printable Radioactivity and Halflife

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Radioactivity and Halflife

Total questions: 25

Worksheet time: 21mins

Name

Class

Date

When nuclei decay, massive amounts of __________ is released.

energy

electrons

protons

neutrons

What type of decay is shown here

²³⁸₉₂U ---> ²³⁴₉₀Th + ⁴₂He.

alpha

beta

gamma

Identify the type of nuclear decay shown here

²¹⁴₈₃Bi→ ⁰_-1e + ²¹⁴₈₄Po

alpha

beta

gamma

When a nucleus undergoes nuclear decay by gamma rays, the atomic number of the element....

remains the same

decreases by one.

increases by one.

increases by two.

The type of radioactive particle that can be stopped by a sheet of paper is the ____.

alpha particle

beta particle

gamma ray

uranium

Finish this equation

²⁰⁹₈₃Bi-->_{_______ +}²⁰⁵₈₁Tl

⁴₂He

⁰_-1e

The most dangerous type of radiation is the ____.

alpha particle

gamma ray

beta particle

uranium

Solve this equation for alpha decay.
₈₅²⁰⁹At = ___ + ₂⁴He

₈₃²⁰⁵Bi

₈₆²⁰⁹Rn

₈₁²⁰⁷Tl

₈₅²⁰⁸At

Identify the missing substance in each of the following nuclear reaction.

_____→¹³⁷₅₆ Ba + ⁰₋₁ e

¹³⁷₅₅Ba

¹³⁷₅₇La

¹³⁸₅₆Ba

¹³⁷₅₅Cs

10.

In the symbol ²⁰⁶₈₂Pb what does 206 stand for?

Mass number

Atomic number

Atomic mass

Number of protons

11.

Where does radioactivity have application in our lives?

Medicine

Energy (electricity)

Agriculture

All of the above

12.

In a nuclear reactor, electricity is produced from what element?

Plutonium

Uranium 235

Radon 220

Lead 232

13.

In a nuclear reactor, electricity is produced from what element?

Plutonium

Uranium 235

Radon 220

Lead 232

14.

Name the instrument used to detect radioactivity.

voltmeter

ohmeter

seismograph

geiger counter

15.

What makes something radioactive?

elements with an atomic number above 81

an unstable nucleus

contaminated sewage

It decays over time

16.

Which type of radiation releases an electron?

Alpha radiation

Beta radiation

Gamma radiation

Theta radiation

17.

Finish the following alpha decay reaction:

18.

Two isotopes of carbon are carbon-12 and carbon-14. These isotopes differ from one another by two protons.

true

false

19.

^{The photo above shows the isotopic notation for which isotope?}

Carbon 12

Carbon 13

Carbon 14

Carbon 15

20.

In order of most to least penetrating radiation we have

Alpha , Beta, Gamma

Beta , Gamma , Alpha

Gamma, Beta, Alpha

Gamma, Alpha, Beta

21.

The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?

3.0g

0.25mg

0.3g

0.25g

22.

After the third half-life, how much of the sample is left?

1/2

1/3

1/16

1/8

23.

You have 100 grams of radioactive C-14. The half life of C-14 is 5730 years.
How many grams are left after 1 half life?

100 grams

25 grams

2 grams

50 grams

24.

Which of the following are radioactive radiation in the form of radioactive ray?

alpha, α

theta, θ

beta, β

gamma, γ

delta, δ

25.

Who discovered gamma ray that is emitted from the nuclei of radium and polonium?

100 %

Radioactivity and Halflife

Total questions: 25

Worksheet time: 21mins

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