Recommended
Recommended
More Related Content
What's hot
What's hot (19)
Similar to Here are the step-by-step workings:1) 10,324 years / 5730 years per half-life = 1.8 half-lives elapsed2) After 1 half-life, 50% of original amount remains 3) After 1.8 half-lives, the remaining amount is (50%)^1.8 = 25% of original4) Original amount was 20g5) 25% of 20g is 0.25 * 20g = 5gTherefore, the approximate amount of 14C remaining after 10,324 years is 5g
Similar to Here are the step-by-step workings:1) 10,324 years / 5730 years per half-life = 1.8 half-lives elapsed2) After 1 half-life, 50% of original amount remains 3) After 1.8 half-lives, the remaining amount is (50%)^1.8 = 25% of original4) Original amount was 20g5) 25% of 20g is 0.25 * 20g = 5gTherefore, the approximate amount of 14C remaining after 10,324 years is 5g (20)
Recently uploaded
Recently uploaded (20)
Here are the step-by-step workings:1) 10,324 years / 5730 years per half-life = 1.8 half-lives elapsed2) After 1 half-life, 50% of original amount remains 3) After 1.8 half-lives, the remaining amount is (50%)^1.8 = 25% of original4) Original amount was 20g5) 25% of 20g is 0.25 * 20g = 5gTherefore, the approximate amount of 14C remaining after 10,324 years is 5g
- 1. Forces
- 2. The concept of forces Newton’s laws tell us how motion is ‘created’ from forces
- 3. Newton’s laws: Force and acceleration • Acceleration is when an object is changing its velocity (like a car accelerating from rest) • Acceleration = change in velocity/time
- 4. 1 2 3 What are the accelerations at the 3 points?
- 5. 1 2 3 What are the accelerations at the 3 points?
- 6. 1 2 3 What are the accelerations at the 3 points?
- 7. 1 2 3 What are the accelerations at the 3 points?
- 8. The force of gravity • Newton discovered gravity in 1686 • What is gravity?
- 9. The force of gravity • Newton discovered gravity in 1686 • What is gravity? • On the Earth, an object falls down with a constant acceleration, g • What is this acceleration?
- 10. Law of gravitation-person on Earth 𝐹𝑔𝑟𝑎𝑣𝑖𝑡𝑦 = 𝐺 𝑀𝑚 𝑟2 𝐹𝑔𝑟𝑎𝑣𝑖𝑡𝑦 = 𝑚𝑔 g = 𝐺𝑀 𝑟2 r m M Mass of Earth, M=5.972*1024 kg Radius of Earth, r=6378.1 km 𝐺 =
- 11. Which object drops faster? If I drop a feather, and I drop a ball, which one falls to the Earth faster? A) According to the law of gravity B) In practice? https://www.youtube.com/watch?v=E43-CfukEgs
- 12. Weight
- 13. What is the gravitational constant on the moon? Mass of Moon, M=0.07346*1024 kg Radius of Moon, r=1.7371 million m gmoon = 𝐺𝑀𝑚𝑜𝑜𝑛 𝑟𝑚𝑜𝑜𝑛 2 𝐺 =
- 14. Mass of Moon, M=0.07346*1024 kg Radius of Moon, r=1.7371 million m gmoon = 𝐺𝑀𝑚𝑜𝑜𝑛 𝑟𝑚𝑜𝑜𝑛 2 What is the gravitational constant on the moon? 𝐺 =
- 15. Static electricity and charges
- 16. Static electricity and charges • Rubbing on the plastic slide caused electrons to be moved from the child to the slide. • This leaves the child positively charged. • We see the evidence of static electricity by observing his hair standing on end. credit: Ken Bosma/Wikimedia Commons
- 17. Coulombs law • Similar charged particles repel (positive force) • Oppositely charged particles attract (negative force) • Can you explain why the boy’s hair stands up from this?
- 18. Charged particles in an atom Image from College Physics by OpenStax
- 19. Charged particles in an atom We just learnt from Coulombs law that like charges repel… So why do the positive charges stick together Within the nucleus??
- 20. Strong nuclear force • The strong nuclear force is what holds the nucleus together • It is an extremely short range force, that binds protons and neutrons, acting over 10-15m, the size of the nucleus. • The strong nuclear force is what gives an atomic bomb its power.
- 21. Weak nuclear force • Anyone heard of spontaneous fission? • Also known as radioactive decay… • Exponential decay in initial mass is characteristic of radioactive substances
- 22. Radiocarbon dating • Half life: characteristic time for sample amount of substance to decay by half its initial amount • A certain form of Carbon (14C) has a half life of 5730 years • The ratio of 2 forms of Carbon (12C and 14C) can be used to tell the age of paintings!
- 23. Suppose an organism has 20 g of 14C at its time of death. Approximately how much 14C remains after 10,324 years? Given: Half life of 14C is 5730 years Radiocarbon dating: Example Problem
- 24. Suppose an organism has 20 g of 14C at its time of death. Approximately how much 14C remains after 10,324 years? Given: Half life of 14C is 5730 years Radiocarbon dating: Example Problem