Radioactive Decay

________________ is the process in which radioactive elements break down releasing fast moving particles and energy.

• Radioactive decay

• Nuclear fusion

• Chemical reaction

• Photosynthesis

________________ is the time it takes for half of the atoms of a radioactive element to decay.

• Half-life

• Isotope

• Radioactive emission

• Radioactive fusion

Scientists often date rocks using ________________.

• Radioactive Dating

• Carbon Dating

• Thermoluminescence Dating

• Dendrochronology

Because Earth's rocks have ____________________ over time, they cannot be used to determine the ______________________________ of the Earth.

• changed; age

• remained the same; composition

• eroded; surface

• formed; structure

Earth formed from __________________, ________________, and ________________ that were left over after the ________________ formed. ____________ pulled lumps of material together.

• Earth formed from dust, gas, and debris that were left over after the sun formed. Gravity pulled lumps of material together.

• Earth formed from water, ice, and rocks that were left over after the moon formed. Magnetism pulled lumps of material together.

• Earth formed from sand, air, and minerals that were left over after the stars formed. Wind pulled lumps of material together.

• Earth formed from lava, smoke, and ash that were left over after the planets formed. Pressure pulled lumps of material together.

Scientists infer that the Earth is about ________________________ years old the same age as the Moon.

• 4.5 billion

• 3.5 billion

• 2.5 billion

• 1.5 billion

A 50.0 g sample of N - 16 decays to 12.5 g in 14.4 seconds. What is it's half - life?

• 14.4 sec

• 7.2 sec

• 3.6 sec

• 1.8 sec

Tags

NGSS.HS-PS1-8

Why is Carbon-14 NOT useful in dating rocks?

• It is does not have predictable decay rates

• Its half life is too short so there is not measurable organic material remaining

• It has a long half life

Tags

NGSS.HS-PS1-8