Answer:
1280 mg
Explanation:
Radioactive decay is a phenomenon that occurs when a certain isotope of an element, said to be radioactive, decays, turning into a lighter nucleus and emitting radiation + energy in the process.
The radioactive decay of this isotope of polonium is described by the equation
where
is the amount of polonium left after time t
is the amount of polonium t time t = 0
is the half-life of the polonium, in days (it is the time it takes for the initial element to halve its amount)
IN this problem, we know that:
After t = 560 days, the amount of polonium left is 
. Therefore, we can re-arrange the equation, substituting t = 560 d, and solve for to find the initial amount of polonium:
Answer:
Explanation:
y = 16 sinπx/15 cos(96πt)
When t = 0
y = 16 sinπx/15
here πx/15 is phase of the point at x
if x = 13
Phase = 13π/15
if x = 16
Phase = 16π/15
Phase difference
= 16π/15 - 13π/15
= 3π/15
= π/5 radian .
True! Some organisms are built for different ecosystems, climates, etc. and some choose to adapt to the living conditions.
I hope that helped!!
Light does not always cause electrons to be emitted.
If it doesn't, then you might think that making the light brighter
would cause electrons to be emitted. That DOESN't work, but
making the light higher FREQUENCY causes electrons to be
emitted !
Did you catch that ? ==> If you light a match next to a piece of metal, and the match burns with a red flame and NO electrons are emitted from the metal, then you can move in with a military searchlight or a ginormous high-power laser that has the same red color and shine it on the metal, and still no electrons will be emitted. But if you light a little match next to the metal and the match burns with a BLUE flame, then electrons WILL be emitted. Knocking electrons out of the metal has nothing to do with how strong and bright the light is. It only depends on the FREQUENCY (color) of the light !
This observation was confusing until the beginning of the 20th Century,
even to the smartest scientists. There was no way to explain it until 1905,
when Albert Einstein pretty much invented Quantum Mechanics to explain
this "Photoelectric Effect".
Of all of Einstein's great discoveries, THIS was the one for which he was
awarded the Nobel Prize in Physics ... in 1922. He never won a Nobel for
his theories of Relativity.
