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How Can We Change Lead Into Gold?. What Element is This?

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Presentation on theme: "How Can We Change Lead Into Gold?. What Element is This?"— Presentation transcript:

1 How Can We Change Lead Into Gold?

2 What Element is This?

3 The Four Universal Forces Gravitational force Gravitational force Electromagnetism Electromagnetism Weak Weak Strong Strong

4 Who Discovered Radioactivity? In 1896, Henri Becquerel, along with Pierre and Marie Curie discovered radioactive waves by placing a rock containing Uranium on a photographic plate. They shared the Nobel Prize in In 1896, Henri Becquerel, along with Pierre and Marie Curie discovered radioactive waves by placing a rock containing Uranium on a photographic plate. They shared the Nobel Prize in 1903.

5 What is Radioactive Decay? Radioactive Radioactive decay is the set of various processes by which unstable atomic nuclei emit subatomic particles (radiation). Radioactive decay is the set of various processes by which unstable atomic nuclei emit subatomic particles (radiation). Decay is said to occur in the parent nucleus and produces a daughter nucleus. Decay is said to occur in the parent nucleus and produces a daughter nucleus.

6 Types of Particles IdentitySymbolChargeMass (amu) Helium (Alpha) 4 α Electron (Beta) 0 β Photon (gamma) 0 γ 0 N/A Neutron1 n Proton1 p Positron0 β

7 What are their properties? Alpha: largest particle, can be stopped by paper Beta: can be stopped by a few layers of clothing Gamma: most penetrating, stopped by lead

8 How To Solve Nuclear Decay Problems?

9 How Can We Date Rocks?

10 Half-life: The time it takes for half the element to decay

11 Half Life Calculations To calculate the ½ life To calculate the ½ life t 1/2 = log 0.5___ log(N o /N) log(N o /N) N = amount remaining N o = amount you started with t = time elapsed t 1/2 = half life x t

12 Half - Life The half life of I-123 is 13 hours. How much of a 64 mg sample is left after 26 hours? The half life of I-123 is 13 hours. How much of a 64 mg sample is left after 26 hours? N o = 64 mg N o = 64 mg t = 26 hours t = 26 hours t 1/2 = 13 hours t 1/2 = 13 hours How many half lives have passed? N = 64 x (0.5) 2 N = 64 x (0.5) 2 N = 16 mg remaining N = 16 mg remaining

13 Half - Life

14 What is the difference between Fission and Fusion? Fission: Splitting of atomic nucleus (nuclear power plant) Fusion: Fusing of atomic nuclei (sun) Both release large amounts of energy

15 What Are The Uses of Radioactivity? There are many practical applications to the use of radioactivity/radiation. There are many practical applications to the use of radioactivity/radiation. Radioactive sources are used to study living organisms Radioactive sources are used to study living organisms To diagnose and treat diseases To diagnose and treat diseases To sterilize medical instruments and food To sterilize medical instruments and food To produce energy for heat and electric power To produce energy for heat and electric power To monitor various steps in all types of industrial processes. To monitor various steps in all types of industrial processes. To determine age of fossils To determine age of fossils


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