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Exploring Radioactivity and Its Effects

Authored by Mr Vallally-Godfrey

Science

9th Grade

10 Questions

Exploring Radioactivity and Its Effects
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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT a type of radioactive decay?

Alpha decay

Beta decay

Gamma decay

Delta decay

Answer explanation

Delta decay is not a recognized type of radioactive decay. The main types are alpha decay, beta decay, and gamma decay, which involve the emission of particles or energy from unstable nuclei.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is meant by the half-life of a radioactive isotope?

The time it takes for all the atoms to decay

The time it takes for half the atoms to decay

The time it takes for the isotope to become stable

The time it takes for the isotope to double in mass

Answer explanation

The half-life of a radioactive isotope is defined as the time it takes for half of the atoms in a sample to decay. This means that after one half-life, 50% of the original atoms remain, making this the correct choice.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a common application of radioactivity in medicine?

X-ray imaging

MRI scanning

Radiotherapy for cancer treatment

Ultrasound scanning

Answer explanation

Radiotherapy for cancer treatment is a common application of radioactivity in medicine, using radioactive substances to target and destroy cancer cells, unlike X-rays, MRI, and ultrasound which do not involve radioactivity.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which type of radiation is the most penetrating and can pass through several centimetres of lead?

Alpha particles

Beta particles

Gamma rays

Neutrons

Answer explanation

Gamma rays are the most penetrating type of radiation, capable of passing through several centimeters of lead due to their high energy and lack of charge, unlike alpha and beta particles which are less penetrating.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a possible health effect of exposure to high levels of ionising radiation?

Improved eyesight

Hair growth

Increased risk of cancer

Stronger bones

Answer explanation

Exposure to high levels of ionising radiation can damage DNA and cells, leading to mutations. This increases the risk of developing cancer, making 'Increased risk of cancer' the correct choice. The other options are not valid health effects.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which equation correctly represents the half-life calculation for a radioactive substance?

Answer explanation

The correct equation for half-life is \(N = N_0 \times \left(\frac{1}{2}\right)^{\frac{t}{T_{1/2}}}\). This formula shows how the quantity of a radioactive substance decreases over time, halving every half-life period.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a difference between nuclear fission and nuclear fusion?

Fission combines small nuclei, fusion splits large nuclei

Fission occurs in the Sun, fusion occurs in nuclear power stations

Fission splits large nuclei, fusion combines small nuclei

Both processes release no energy

Answer explanation

The correct choice is that fission splits large nuclei while fusion combines small nuclei. Fission occurs in nuclear power plants, and fusion occurs in stars like the Sun, both releasing energy.

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