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(a) (i) A radioactive sample produces 5120 decays at one point in an experiment and 40.96 minutes later produces 320 decays per minute. What is the half life?
(ii) What is the decay constant?
(iii) What is the mean lifetime of the material?
(b) What fraction of a sample of germanium-68 is left after 4.5 yr. (the half-life of germanium-68 is about 9 months)
(c) What period of time is required for a sample of radioactive sulfur-35 to lose 85% of its activity? (The half-life of this sample is 87.38 days)?
The elements in a series RCL circuit are a 106 Ω resistor, a 3.30 µF capacitor, and a 0.0310 H inductor. The frequency is 609 Hz. What are the impedance of the circuit
How many electrons are transferred. What is the smallest thickness of a soap film that would appear black if illuminated with 490 light? imagine there is air on both sides of the soap film.
A 90 kg astronaut and a 1600 kg satellite are at rest relative to the space shuttle. The astronaut pushes on the satellite, giving it a speed of 0.24 m/s directly away from the shuttle.
What must be the area of a suction cup that is completely evacuated and a ceiling if the cup is to support a child who weighs 30 kg
A boat with speed of 10m/s, in still water, tries to cross a river with a current flow of 2.0m/s, and is 100m wide. how far down river does it land
How much work done against force of gravity
A woman inside an elevator is standing on a scale. Before the elevator starts moving the scale shows 50 kg, calculate the acceleration of the elevator if after the elevator starts moving upward the scale reads 70kg. What will the reading of the sc..
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You want to throw a pebble at a window located 9.6 m above the ground, making sure that the pebble hits the lowest part of the window with a strictly horizontal velocity. What is the velocity with which the pebble hits the window
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An air-filled capacitor consists of two parallel plates, each with an area of 7.06 cm2, separated by a distance of 1.28 mm, Find the capacitance
Two large parallel metal plates are 1.4 cm apart and have charges of equal magnitude but opposite signs on their facing surfaces. what is the electric field (in V/m) in the region between the plates
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