Explain what is the half-life of the substance

Reference no: EM13716781

Question - Part A

You are using a Geiger counter to measure the activity of a radioactive substance over the course of several minutes. If the reading of 400. counts has diminished to 100. counts after 36.9minutes , what is the half-life of this substance?

Part B

An unknown radioactive substance has a half-life of 3.20hours . If 11.1g of the substance is currently present, what mass A0 was present 8.00 hours ago?

Express with the appropriate units.

Explicate the each step. Explicate the process and each step.

Reference no: EM13716781

Questions Cloud

Explain the reaction of aqueous sodium chloride : The reaction of aqueous sodium chloride and aqueous silver nitrate is represented by the balanced ionic equation.

Enter the compound formula of substance : Enter the compound formula, including state, of the missing substance ( Y ) in the balanced equation below. Do not give the coefficient. Polyatomic ions only need parentheses when there is more than one of the given ion in the molecular formula.

State the purpose for adjusting the water level inside : State the purpose for adjusting the water level inside/outside of a gas collecting vessel to be equal when determining the moles of gas evolved in the reaction

Calculate helium gas molar volume : The density of helium gas is 0.1785 g/L. Calculate its molar volume. Molecular weight of He= 4.00 g/mol. Hint L/mol. (please show steps)

Explain what is the half-life of the substance : You are using a Geiger counter to measure the activity of a radioactive substance over the course of several minutes. If the reading of 400. counts has diminished to 100. counts after 36.9minutes , what is the half-life of this substance

How much heat is required to warm ice : How much heat (in kJ) is required to warm 13.0 g of ice, initially at -110.0?C? The heat capacity of ice is 2.09 J/g??C and that of steam is 2.01 J/gC

Enter the formula and state of all ions in solution : If a precipitation reaction occurs when a solution of one species is added to a solution of the other, enter the formula, including the state, of the insoluble product. If there is no reaction, enter the formula and state of all ions in solution, ..

Polyatomic ions only need parentheses when one ion given : Enter the compound formula, including state, of the missing substance ( Y ) in the balanced equation below. Do not give the coefficient. Polyatomic ions only need parentheses when there is more than one of the given ion in the molecular formula.

Define the balanced complete ionic equation for the reaction : The reaction of aqueous zinc chloride and aqueous potassium phosphate is represented by the balanced net ionic equation. 3Zn2+(aq) + 2PO43-(aq) -----> Zn3(PO4)2(s) Give the balanced complete ionic equation for the reaction. Include the states.

User Account

All Pages