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A radiation detector is in the form of a circular disc of diameter 3.0cm. It is held 25cm from a source of radiation, whereit records 1250 counts per second. Assuming that the detector records every radiation incident upon it, find the activity of the sample (in curies).
A 3690-line/cm grating produces a third-order fringe at 21.4deg angle. What wavelength of light is being used
The radius of the GM tube's window is 3.5 cm. The source is 3 cm from the GM tube. Compare the surface area of a sphere 3 cm from the source to the area of the GM tube's window.
the near and far points of a person are at 40cm and 250cm respectively. find the power of the lens heshe shoeld use
A hard disk in your computer spins at 5400 rpm. if this disk turns through 12 revolutions before coming to a stop, find the disks angular acceleration
A marble is rolled down a ramp with a height of .15 m. The marble travels a distance of 1.38 m. What is the velocity of the marble
The hydrogen alpha emission spectra has a 658.28 nanometer wavelength. What is the red-shifted wavelength of hydrogen alpha light from the bootes galaxy cluster
An engine flywheel initially rotates counterclockwise at 5.39 rotations per second. Then, during 21.3 seconds, its rotation rate changes to 2.11 rotations per second clockwise. Find the flywheel\'s average angular acceleration (including its sign) in..
At the Earth's surface a projectile is launched straight up with aspeed of 10.1 km/s. To what height will it rise. Ignore airresistance and the rotation of the Earth.
question1two blocks are associated by a light string that passes over a frictionless pulley. the block of mass m1 lies
After a plant or animal dies, its 14C content decreases with a half-life of 5730 years. what is the age of the ancient site
a diver springs upward with an initial speed of 1.7 ms from a 4.0-m board.a find the velocity with which he strikes the
A source delivers an AC voltage of the form change in v = 98.0 sin (80(pi)t), where change in v is in volts and t is in seconds, to a capacitor. Find the frequency of the source
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