Contamination and irradiation

Is radioactive decay 'spontaneous' ?

• yes

• no

• sometimes

Tags

NGSS.HS-PS1-8

What is the half-life of iodine-131?

• 32 days
• 8 days
• 16 days
• 24 days

Tags

NGSS.HS-PS1-8

What type of decay is being illustrated in following picture? 

• beta decay
• alpha decay 

Tags

NGSS.HS-PS1-8

Which model of the atom is denoted as the "plum pudding" model?

• A

• B

• C

• D

• E

This model added on to previous models by showing electrons existed at certain "energy levels". However it does not accurately show what those levels look like.

• The "Bohr Model" of the atom
• The "Rutherford Model" of the atom
• The "Plumb Pudding Model" of the atom
• The "Quantum Mechanical Model" of the atom

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

This model was developed after J.J. Thompson discovered electrons, a particle smaller than an atom. Is shows electrons floating freely in a positive space.

• The "Plum Pudding Model" of the atom
• The "Rutherford Model" of the atom
• Democritus's model of the atom
• The "Quantum Mechanical Model" of the atom

Carbon-14 and carbon-12 are two of the isotopes of carbon. The nucleus of a carbon-12 atom has the same number of ________________ as the nucleus of a carbon-14 atom.

• protons

• neutrons

• electrons

State the number of neutrons in an atom of iodine-135 (¹³⁵₅₃I)

• 78

• 82

• 131

• 53

Use the graph to determine the half-life of the radioactive sample. The x-axis label is time in seconds

• 1 minute

• 20 seconds

• 40 seconds

• 80 seconds

State the likely count rate after 180 seconds

• 20 counts per minute

• 10 counts per minute

• 5 counts per minute

• 2 counts per minute