Answer:
law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time.
Answer:
Explanation:
No of atoms of Ra in 1 g of sample = 6.023 x 10²³ / 226
N = 2.66 x 10²¹
disintegration constant λ = .693 / half life
half life = 1620 x 365 x 60 x 60 x 24 = 5.1 x 10¹⁰ s
disintegration constant λ = .693 / 5.1 x 10¹⁰
radioactivity dn / dt = λN
= (.693 / 5.1 x 10¹⁰ ) x 2.66 x 10²¹
= .3614 x 10¹¹ per sec
= 3.614 x 10¹⁰ / s
Hey can u give a little more detail?
Answer:
the rigid outer part of the earth, consisting of the crust and upper mantle.
Explanation:
Answer:
a car
A sled sliding across snow or ice.
a ball down a hill
mercury
Explanation: