Radiactivity Recall assesment Flashcards
How do two isotopes of the same element differ from each other?
A. Different mass and different proton number
B. Different Mass and same proton number
C. Same mass and different proton number
D. Different amounts of energy
B.
How big across is an atom
A. 0.001 m (1 mm)
B. 0.000,000,1 m (1x10^-7 m)
C. 0.000,000,000,1 m (1x10^-10 m)
D. 0.000,000,000,000,001 m (1x10^-15 m)
C.
What is the relative charge of a neutron?
0
Which statement describes Thomson’s work most accurately?
A. He discovered the electron, but knew that atoms were neutral, so he thought up a model where the electrons were stuck on a positive mass. He was wrong about that.
B. He discovered the electron, but knew that atoms were neutral, so he came up with the correct model of a positive nucleus surrounded by electrons
C. He fired particles at gold foil and discovered that atoms are mostly empty space. He was correct.
A.
What did Rutherford, Geiger and Marsden fire at gold foil to explore the structure of
an atom?
A. Alpha particles
B. Gamma rays
C. Protons
D. Electrons
A.
What did Rutherford, Geiger and Marsden see happen to the particles they fired at the
gold foil?
A. All deflected back
B, most were deflected back some went through
C. Most went straight through, a few were deflected, a very few were deflected back
D. All went straight through
C.
What happens to an atom if it receives energy?
A. An electron can move into a higher shell (excitation), or escape completely (ionisation)
B. An electron can move into a higher shell (ionisation), or escape completely (excitation)
C. It can be completely destroyed
D. An electron can move into a higher shell (excitation), or escape completely (de-excitation)
A.
Select the list of radioactive decay particles from MOST to LEAST penetrating.
A. Alpha beta gamma
B. Alpha gamma beta
C. Gamma alpha beta
D. Gamma beta alpha
D.
How does the nucleus of an atom that undergoes beta (-minus) emission change?
A. No charge
B. Mass number down by 4, proton number down by 2
C. Mass number unchanged, proton number down by one
D. Mass number unchanged, proton number up by one
D.
How does beta (-minus) emission occur?
A. A neutron in the nucleus of the atom turns into a proton and an electron. The electron is ejected.
B. A proton in the nucleus of the atom turns into a neutron and an electron. The electron is ejected.
C. An electron in the outer shell of the atom is given so much energy it escapes.
D. The nucleus breaks apart, leaving only electrons behind
A.
How does the nucleus of an atom that undergoes beta (-minus) emission change?
A. No charge
B. Mass number unchanged, proton number down by one
C. Mass number unchanged, proton number up by one
D. Mass number down by 4, proton number down by 2
C
How does the nucleus of an atom that undergoes positron (beta-plus) emission change?
A. No charge
B. Mass number unchanged, proton number down by one
C. Mass number unchanged, proton number up by one
D. Mass number down by 4, proton number down by 2
B.
How does the nucleus of an atom that undergoes alpha emission change?
A.no change
B. Mass number unchanged, proton number down by one
C. Mass number unchanged, proton number up by one
D. Mass number down by 4, proton number down by 2
D.
Define half-life
A. The time taken for the nucleus to decay.
B. The time taken for the activity in a sample to halve.
C. The time taken for radioactivity to happen
D. Half the time taken for all of the nuclei in a sample to decay.
B.
Name the equipment used for detecting radioactivity
A. Data logger
B. Motion sensor
C. Geiger mueller tube
C
