Nuclear Physics

Iodine-131 has a half life of 8 days. A sample starts with 3000 radioactive nuclei. How many days will it take to have 94 nuclei left?

Hint you have to half a few times, but remember how long it takes to half!

• 32 days

• 40 days

• 375 days

• 16 days

Tags

NGSS.HS-PS1-8

The walls of a nuclear reactor are made of ______

• iron

• concrete

• copper

• carbon

Eating Radioactive material is

• Irradiation

• Contamination

Tags

NGSS.HS-PS1-8

Why might irradiation be hazardous?

• Irradiated bodies will become radioactive.

• Can cause damage to living cells

• It kills bacteria and other organisms.

Why might contamination be hazardous?

• You could become The Hulk.

• Can cause damage to living cells by mutating them.

• Can cause damage to living cells by ionising them.

How can people protect themselves from irradiation? (Choose as many as you believe to be correct)

• Stand further away from the source.

• Wear protective equipment.

• Remove contamination.

• Reduce the amount of time being irradiated.

Tags

NGSS.HS-PS4-3

When nucleus undergoes____________decay.

• a) Alpha

• b) Beta

• c) Both a &b

• d) Gamma

Tags

NGSS.HS-PS1-8

The equation of half life period is

• T_1/2=0.693/λ

• T_1/2=0.963/λ

• T_1/2=0.639/λ

• T_1/2=0.699/λ

Tags

NGSS.HS-PS1-8

The attractive forces between nucleons are

• a) Low range

• b) Short range

• c) Maximum range

• d) Min range

The half life periods of U²³⁸.............

• a) 4.5x10⁹ Years

• b) 4.3x10⁸ Years

• c) 4.3x10⁷ Years

• d) 4.3x10⁶ Years

Tags

NGSS.HS-PS1-8