Form 3: Chapter 8
RADIOACTIVITY
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Name: *
Match each of the scientists with the contributions in radioactivity. *
3 points
Wilhelm Roentgen
Henri Becquerel
Marie and Pierre Curie
Discovery of uranium which is a radioactive compund
Discovery of radioactive radiation through ionisation power
Discovery of X-ray through photography
Classify the following into ionising radiation and non-ionising radiation. *
8 points
Ionising radiation
Non-ionising radiation
Infrared
Radio wave
Gamma ray
X-ray
Visible light
Beta radiation
Alpha radiation
Microwave
Moderate penetrating power *
1 point
High penetrating power *
1 point
High ionising power *
1 point
No charge, electromagnetic wave *
1 point
Fast moving electrons *
1 point
Positive charge, helium nucleus *
1 point
Match the following usage of radioactive radiations correctly. *
6 points
Carbon-14
Beta radiation
Phosphorus-32
Gamma ray
Cobalt-60
Sodium-24
To detect the position of blood clot in blood vessel
Used in the preservation of food such as fruits and potatoes
To determine the rate and quantity of fertilisers absorbed by the plants
Used to kill cancerous cells in radiotherapy treatment
Determine the age of objects or artefacts
Control the thickness of metal sheets in the factory
Match the following functions correctly. *
2 points
Film badge
Robotic hand
Allow scientists to handle radioactive substance without being near to the source of radioactive substance
Detects the radioactive radiation dose being absorbed by the body
Mark (/) for the unit for radioactivity. *
2 points
Iodine-131 has a half-life of 8 days. The initial mass of an iodine is 80 g. Calculate the mass of iodine-131 after 24 days. *
1 point
Iron-59 has a half-life of 44.5 days. Iodine-131 has a half-life of 8 days. These two radioactive substances are used as tracer in the body in medical field. Based on the information given, which radioactive substance stays longer after being injected into the patient’s body with the same amount? *
1 point
Particle T has 35 protons and 36 electrons. What is particle T? *
1 point
Particle S has 20 protons and 18 electrons. What is particle S? *
1 point
Particle X has 5 protons and 5 electrons. What is particle X? *
1 point
1 joule of ionising radiation energy absorbed by 1 kilogram of living tissues *
1 point
A radioactive substance P has a half-life of 35 minutes. What is the time taken in minutes for 93.75% of its atoms to decay? *
1 point
Substance P has an initial mass of 512 g and a half-life of 3 minutes. Substance Q has an initial mass of 8 g and a half-life of 9 minutes. How many minutes are required so that the mass of P is equal to the mass of Q? *
1 point
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