Radioactivity is a process that requires external intervention.
False
During alpha decay, the atomic number decreases by two
Gamma decay involves the emission of a high-energy photon
During gamma decay, the atomic number and mass number remain
What type of decay is illustrated by the example \( ^{238}_{92}U \rightarrow ^{234}_{90}Th + ^{4}_{2}He \)?
Alpha decay
What happens to the atomic number and mass number during alpha decay?
Atomic number -2, mass number -4
The penetrating power of alpha particles is low
Match the type of decay with its description:
Alpha decay ↔️ Emission of a helium nucleus
Beta decay ↔️ Emission of an electron or positron
Gamma decay ↔️ Emission of a high-energy photon
Order the types of radioactive decay from highest to lowest penetrating power:
1️⃣ Gamma decay
2️⃣ Beta decay
3️⃣ Alpha decay
The range of gamma particles in air is very long
Order the types of decay based on their balanced nuclear equation format:
1️⃣ Alpha decay
2️⃣ Beta decay
3️⃣ Gamma decay
What is the emitted particle in alpha decay?
Alpha particle
What is radioactivity defined as?
Spontaneous emission of radiation
Arrange the three types of radioactive decay in order of increasing penetration power.
1️⃣ Alpha decay
2️⃣ Beta decay
3️⃣ Gamma decay
Beta decay involves the emission of an electron or positron.
True
Gamma rays have the highest penetration power compared to alpha and beta particles.
True
Match the type of decay with the corresponding nuclear change:
Alpha decay ↔️ Atomic number -2, mass number -4
Beta decay ↔️ Atomic number ±1, mass number unchanged
Gamma decay ↔️ No change in atomic or mass number
During beta decay, a neutron converts into a proton, emitting an electron
Match the type of beta decay with its nuclear change:
β- decay ↔️ Atomic number +1, mass number unchanged
β+ decay ↔️ Atomic number -1, mass number unchanged
Which type of decay requires substantial shielding due to its high penetrating power?
Gamma decay
Gamma decay emits a high-energy photon
Alpha decay has the highest ionizing power among the three types of decay.
True
What is the range of alpha particles in air?
Few centimeters
To write a balanced nuclear equation, the atomic number and mass number must be conserved
Beta decay can result in either the emission of an electron or a positron.
True
Activity is measured in Becquerels (Bq) or curies (Ci).
True
Match the type of radioactive decay with its description:
Alpha decay ↔️ Emission of a helium nucleus
Beta decay ↔️ Emission of an electron or positron
Gamma decay ↔️ Emission of a high-energy photon
What is the primary goal of radioactive decay?
Achieve a stable state
Match the type of decay with the particle emitted:
Alpha decay ↔️ Helium nucleus
Beta decay ↔️ Electron or positron
Gamma decay ↔️ High-energy photon
What are the two types of particles emitted in beta decay?
Electron and positron
Which type of radioactive decay has the highest penetrating power?
Gamma decay
In beta minus decay, what happens to the atomic number of the nucleus?
Increases by 1
Alpha particles have low penetrating power due to their large size
In alpha decay, the atomic number of the daughter nucleus decreases by 2
In gamma decay, the atomic number and mass number remain the same.
True
What type of particle is emitted during gamma decay?
γ
During beta decay, a positron has a positive electric charge
The activity of a radioactive substance is measured in Becquerels or Curies
The exponential decay equation relates the number of radioactive nuclei at time t to the decay constant λ and the initial number of nuclei N0 using the term e