What is the reactivity of the mantle

Reference no: EM13273257

Gas lanterns used on camping trips have mantles (small lacy bags that give off light) made from a rayon mesh impregnated with thorium and other materials. Thorium is used, even though it is radioactive, because it forms an oxide that can withstand being incandescent for long periods of time. Almost all natural thorium is 232 90 Th, which has a half life of 1.405x10^10y.

(a) A typical mantle contains 439 mg of thorium. What is the reactivity of the mantle? decays/s

(b) If the half-life of thorium had been triple its actual value, by what factor would the activity of the mantle be changed? reduce by a factor of 3

Reference no: EM13273257

Questions Cloud

Research report on malaysian airlines : Research report on Malaysian Airlines which has been crashed with 290 people on board. -possibly having been shot down - in eastern Ukraine.

What is the expected return : You own a 15 year,1000 par value bond pauing 8 percent interest. Tthe market PRICE IS $775 and your rate of return is 13%.

Violation of miranda rule may be used to impeach a defendant : Statements taken in violation of the Miranda rule may be used to impeach a defendant that testifies inconsistently with his confession. However, an involuntary confession cannot be used for impeachment. What justifies the distinction between these tw..

What is the speed of the two-cart center of mass : A cart with mass 230 g moving on a frictionless linear air track at an initial speed of 1.7 m/s undergoes an elastic collision with an initially stationary cart of unknown mass, What is the speed of the two-cart center of mass

What is the reactivity of the mantle : Gas lanterns used on camping trips have mantles (small lacy bags that give off light) made from a rayon mesh impregnated with thorium and other materials. A typical mantle contains 439 mg of thorium. What is the reactivity of the mantle

What is the trader profit : Thus, the trader receives a net credit of $200 when entering the spread position. If the stock rises to $50, then what is the trader's profit?

Benefits of the program or project : The purpose of the program or project and the target population or audience - select a program, quality improvement initiative, or other project from your place of employment. Assume you are presenting this program to the board for approval of fund..

What is the displacement current in the wire : A silver wire has resistivety p = 1.62x10^-8 ?m ana cross sectional area of 5.00 mm^2. what is the displacement current in the wire

What was the 2012 earnings per share : For 2012, LBJ Corporation reported net income of $40,000; net sales $1,400,000; and weighted average shares outstanding of 10,000. There were no preferred stock dividends. What was the 2012 earnings per share?

User Account

All Pages