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The radioactive isotope has a half-life of 2.60 y and has a half-life of 87.0 days . They each emit positive β- particles or positrons. A sample of each is prepares on June 1 and when placed on the window of a Geiger counter the gives 5000 counts per second and the 20000 counts per second. when will the two samples have the same activity , and what will the count rate be at that time?
imagine that we have a string 1.5 meters long that is fixed at both ends. what is the frequency of the normal mode of the strings oscillation that has 3 antinodes
An amount of ideal gas is con?ned to a sealed box at one-half atmospheric pressure, i.e., 50.65 kPa. What is the new pressure of the gas in the smaller box
A simple camera telephoto lens consists of two lenses. The objective lens has a focal length f1 = +44.0 cm. How far behind the concave lens should the film be placed
The pressure inside a gas bottle at 25.5 °C is 3630 kPa. What will be the pressure inside the bottle
A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. What is the work done on the jet by the catapult
A free electron and a free proton are exactly 1.2cm apart. Find the magnitude of the acceleration of the proton
We have a container of compressed air. Assume that air is diatomic ideal gas. The volume of the container is 1.35 liters. Find the final volume of the gas
As you think about it, you're not sure he threw the ball exactly horizontally, What is the range of speeds with which the ball might have left his hand, Enter the minimum and the maximum speed of the ball
The men's world record for the shot put, 23.12 m, was set by Randy Barnes of the United States on May 20; 1990.If the shot was launched from 6 ft above the ground at an initial angle of 42degrees, what was its initial speed.
A 5.00 uF and a 7.00 uF capacitor are connected in series, and this combination is connected across a 48.0V potential difference. Calculate the potential difference across first one
A helium atom (m= 6.6465 x 10^-27 kg) collides elastically with an oxygen atom (m = 2.6560x10^26kg) at rest. Find the speed of the oxygen atom
What is the frequency of the small axial oscillations that electron will undergo if it is released along the z-axis near the origin.
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