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a) An ionization chamber is used with an electrometer capable of measuring 50µA. Calculate the rate at which 0.835MeV beta particles must enter the chamber to just produce a measurable response.
b) These beta particles produce on the average 80 ion pairs in a counter operating in the proportional region with a gas amplification factor of 6´104.At what rate will the particles need to enter the chamber to produce an average current of 50µA?
A single human cell encloses about 1.5m of DNA containing4.5 billion base pairs. What is the spacing between these base pairs in nanometers
An object is placed 5 cm in front of a spherical mirror. A virtual image is formed 10 cm behind the mirror. What is the magnification of the mirror
There are two parallel straight wires with the length of 40 cm long and they are separated by 5 cm. what is the magnetic force on the right side wire
Examining your imange in a convex mirror whose radius of curvature is 24.6cm, Where is the image of your nose located
A tortoise can run with a speed of 0.11 m/s, and a hare can run 20 times as fast. In a race, determine How long does the race take
A camera takes a perfectly exposed picture when the lens diaphragm is set to f/4 and the shutter speed is 1/250 s, what should the new shutter speed be so that the exposure is still correct
A horizontal steel bar, 4m long and 2 cm diameter is imbedded in two concrete walls. A 2000 kg mass is hung from its center. By how much does the center sag
Batteries are rated in terms of ampere-hours (A · h). For example, a battery that can produce a current of 2.00 A for 3.00 h is rated at 6.00 A · h. At $0.0830 per kilowatt-hour, what is the value of the electricity produced by this battery
An object is found to have a weight in air of 500N. It is then tied to a string connected to a balance and immersed in water (density of water is 1000 kg/m3). The scale now reads 450 N. at last the object is immersed in oil and is found to have a ..
A force of 150 N is applied to the edge of a disk. If the disk has a mass of 0.75 Kg with a radius of 0.50 m, how fast is its angular acceleration
How many electrons would have to be added to one of these spheres to make it electrically neutral?
in music two notes are said to be an octave apart when one note is exactly twice the frequency of the other. suppose
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