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A cancer treatment called the gamma knife uses focused 60Co sources to treat tumors. Each 60Co nucleus emits two gamma rays, of energy 1.33MeV and 1.17MeV, in quick succession. Assume that 50.0% of the total gamma-ray energy is absorbed by a tumor. Further assume that the total activity of the 60Co sources is 1.00mCi, the tumorâ€TMs mass is 0.100 kg, and the patient is exposed to the gamma radiation for an hour. Determine the effective radiation dose received by the tumor. (Since the 60Co half-life is 5.3 years, changes in its activity during the treatment are negligible).
Two light sources are used in a photoelectric experiment to determine the work function for a particular metal surface. What stopping potential would be observed when using light from a red lamp
A muon is created at the top of Mount Nanga Parbat (height 8,100 m) and travels at constant speed to sea level, what is the height of Mount Nanga Parbat
At t=0 a grinding wheel has an angular velocity of 24.20 rad/s. It has a constant angular acceleration of 24.2 rad/s^2 until a circuit breaker trips at t = 1.2 seconds.
A standardized biological microscope has an 8.0--focal-length objective. What focal-length eyepiece should be used to achieve a total magnification of.
A sample of helium behaves as an ideal gas as it is heated at constant pressure from 273 K to 343 K. what is the mass of helium present
Suppose you pour water into a container until it reaches a depth of 12 cm, What is the pressure at the bottom of the container
A point charge causes an electric flux of -670 N·m2/C to pass through a spherical Gaussian surface of 18.0 cm radius centered on the charge. What is the value of the point charge
A boy flies a kite with the string at a 30 degree angle to the horizontal. The tension in the string is 4.5N. How much work does the string do on the boy
a 0.50 uF capacitor is charged to a 12V battery. How much electrical potential energy is stored in the capacitor
The second-order dark fringe in a single-slit diffraction pattern is 1.40 mm from the center of the central maximum. calculate the wavelength of the incident light
A metal sphere with radius r_a is supported on an insulating stand at the center of a hollow, metal spherical shell with radius r_b. There is charge + q on the inner sphere and charge - q on the outer spherical shell. Take potential V to be zero w..
A circular hole in an aluminum plate is 3.263 cm in diameter at 0.000°C. What is its diameter (in cm) as the temperature of the plate is raised to 129.8°C? Give the answer to four significant figures. The linear expansion coefficient of aluminum i..
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