Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of...

Question

Question

Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of...

Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of 432 years. How long will it take in years for 44.0 % of an Am-241 sample to decay?

science chemistry

Add a comment Improve this question Transcribed image text

Answer 1

Answer #1

t1/2 = 0.693/K

K = 0.693 / 432

K = 1.6042 * 10^-3

K = 2.303/t log(a / (a-x))

1.6042 * 10^-3 = 2.303 / t log (100/(100-44))

t = 361.5 years.

Add a comment

Answer 2

Similar Homework Help Questions

Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of...

Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of 432 years. How long will it take in years for 32.0 % of an Am-241 sample to decay? Express your answer numerically in years.
Americium-241 is widely used in smoke detectors. Calculate the amount of americium-241 consumed in a smoke...

Americium-241 is widely used in smoke detectors. Calculate the amount of americium-241 consumed in a smoke detector (initially containing 5.40 ug of Am) that has been used for one year if the half- life is 433 years.
Americium-240 has a half-life of 2.12 days. (Can you see why americium-241 is used in smoke...

Americium-240 has a half-life of 2.12 days. (Can you see why americium-241 is used in smoke detectors rather than americium-240? See exercise 4.) How many hours does it take for 34.5% of a sample of americium-240 to decay? answer should be 31.1 hr

The isotope 241 95 Am is an alpha-particle emitter with a half-life of 432 years. (c) The activity of the 241 95 Am in a...

The isotope 241 95 Am is an alpha-particle emitter with a half-life of 432 years. (c) The activity of the 241 95 Am in a smoke detector is 1 µCi. How long will it take for the activity to drop to 0.9 µCi? (d) How many atoms of 241 95 Am have transmuted during the time for the activity to drop to 0.9 µCi? (e) Calculate the Q value in MeV for this α−decay of 241 95 Am. (f) Calculate...
B) An unknown radioactive substance has a half-life of 3.20 hours. If 47.3 g of the...

B) An unknown radioactive substance has a half-life of 3.20 hours. If 47.3 g of the substance is currently present, what mass A0 was present 8.00 hours ago? Express your answer with the appropriate units. C) Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of 432 years. How long will it take in years for 30.0 % of an Am-241 sample to decay? Express your answer with the appropriate units. D) A fossil...
An unknown radioactive substance has a half-life of 3.20 hours. If 39.6 g of the substance...

An unknown radioactive substance has a half-life of 3.20 hours. If 39.6 g of the substance is currently present, what mass Ao was present 8.00 hours ago? Express your answer with the appropriate units. View Available Hint(s) ? OP HÅR A9 = Value O 2 Units Submit Part C Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of 432 years. How long will it take in years for 34.0 % of an Am-241...

Some smoke detectors (see the figure below) use the radiation produced by the decay of 241...

Some smoke detectors (see the figure below) use the radiation produced by the decay of 241 95 Am (half-life 432 yr) to ionize air molecules, which in turn produces a steady current across two electrodes. If smoke enters the region of ionization, the alpha particles are absorbed by the smoke particulates, reducing the current across the electrodes. The electronic circuitry then sounds the alarm when it senses any current reduction. How long does it take for the activity of 241...
A) You are using a Geiger counter to measure the activity of a radioactive substance over...

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 48.2 minutes , what is the half-life of this substance? B) An unknown radioactive substance has a half-life of 3.20 hours . If 24.3 g of the substance is currently present, what mass A0 was present 8.00 hours ago? C) Americium-241 is used in some smoke detectors....
1. Smoke detectors use Am-241, an alpha emitter, to detect smoke particles. A parent is concerned...

1. Smoke detectors use Am-241, an alpha emitter, to detect smoke particles. A parent is concerned that having a smoke detector may expose their child to radioactivity. Which explanation most accurately addresses this concern? a Concern is justified since inhaling even small amounts of alpha particles is bad. b Smoke inhalation risk is immediate and cancer risk from radiation long-term. c If the detector is on the ceiling, the radioactivity exposure is minimal. d Alpha particles don't travel far and...

a) You are using a Geiger counter to measure the activity of a radioactive substance over...

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 76.2 minutes , what is the half-life of this substance? b)An unknown radioactive substance has a half-life of 3.20 hours . If 14.6 g of the substance is currently present, what mass A0 was present 8.00 hours ago? c) Americium-241 is used in some smoke detectors. It...

Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of...

Homework Answers