TOPIC 26 RADIOACTIVITY
Authored by Abby Wani
Physics
11th Grade
Used 2+ times
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12 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which type of radiation consists of electrons?
alpha-particles
beta-particles
gamma-rays
X-rays
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A sample of a radioactive isotope produces a count rate of 10 000 counts per minute. The half-life of the isotope is one day.
What was the count rate of the sample two days ago?
2500 counts per minute
5000 counts per minute
20 000 counts per minute
40 000 counts per minute
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A
B
C
D
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which states the three types of radiation emitted by radioactive isotopes in order of their ionising effect from highest to lowest?
alpha-particles, beta-particles, gamma-rays
alpha-particles, gamma-rays, beta-particles
beta-particles, gamma-rays, alpha-particles
gamma-rays, beta-particles, alpha-particles
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which statement about the half-life of a radioactive isotope is correct?
Half-life changes as the isotope decays.
Half-life is the time it takes for the nucleon number of the isotope to halve.
Half-life is half the time it takes for the number of nuclei of the isotope to decrease to zero.
Half-life is the time it takes for the number of nuclei of the isotope to decrease by half.
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A factory continuously produces plastic sheets. A radioactive isotope and a detector are used to check the thickness of the sheets.
What is the most suitable source to use?
an alpha source with a half-life of a few minutes
an alpha source with a half-life of several years
a beta source with a half-life of a few minutes
a beta source with a half-life of several years
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A source contains a radioactive material.
Without the radioactive source present, a detector records a background count rate of 20 counts per minute.
This source is placed in a fixed position near the detector. Initially a count rate of 520 per minute is recorded.
What count rate is recorded after a time of two half-lifes of the radioactive source?
125 counts per minute
130 counts per minute
135 counts per minute
145 counts per minute
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