ET unit 11 -- nuclear decay

Uranium-238  decays into Thorium-234  by emitting ---

• an alpha particle

• a beta particle

• gamma rays

• visible light

The nucleus is held together by the ___________________________force.

• The Strong Nuclear Force

• The Weak Nuclear Force

• Electromagnetism

• Gravity

Has the highest penetrating power.  Can penetrate our body.  Even a thick layer of lead or concrete cannot stop all of it.

• Alpha radiation

• Beta radiation

• Gamma radiation

How many protons are in this atom?

• 3
• 4
• 6
• 10

How many neutrons are in this isotope of Uranium?

• 235
• 92
• 327
• 143

Gamma rays have ---

• no mass

• mass equal to a proton

• the same mass as an electron

• 1 mass unit

How is the alpha particle written in a nuclear equation?

• ⁴₂He

• ²₄He

• ⁰_-1e

• ⁰₀γ

A helium nucleus with two protons and two neutrons is called a(n) ____.  

• alpha particle
• electroscope
• beta particle
• gamma ray

Which type of nuclear radiation is being emitted here?

• Alpha
• beta
• gamma 
• none

Has the symbol

• Alpha
• Beta 
• Gamma