Answer:
Explanation:
Given:
Initial mass of isotope (m₀) = 20 g
Half life of the isotope 
= (ln 4) years
The general form for the radioactive decay of a radioactive isotope is given as:
Where,
So, the equation is: 
At half-life, the mass is reduced to half of the initial value.
So, at 
. Plug in these values and solve for 'k'. This gives,
Hence, the equation for the mass remaining is given as:
The mass of the object doesn't matter. The change in its momentum is equal to the impulse that changed it ... 15 N-sec.
Stars are not spread uniformly across the universe but are normally grouped into galaxies along with interstellar gas and dust. A typical galaxy contains hundreds of billions of stars and there are more than 2 trillion galaxies
So u wanna use density is mass/volume, mass can be found by a weighing scale but for volume u wanna fill a measuring cylinder with water and note the initial volume of water in it, (u can decide how much water to fill in it) and then u place the chess piece in the measuring cylinder, this will cause the water to rise and then u measure the final volume of water and do final volume - initial to find volume
Explanation:
\huge \colorbox{red}{✍ Answer}✍ Answer
