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A hospital patient has been given 131I (half life= 8.04 days) which decays at 4.5 times the acceptable level for exposure to the general public. How long must the patient wait to reach the acceptable level? Assume that the material merely decays and is not excreted
1. 7.6 days
2. 17 days
3. 12 days
4. 8.4 days
Light of wavelength 650 nm passes through a single slit of width 0.05 mm. What is the angular spread of the central diffraction maximum
A 135 mCi radioactive tracer is made in a nuclear reactor. When it is delivered to a hospital 18 hours later its activity is 85 mCi. The lowest usable level of activity is 10 mCi. What is the tracer's half-life
A long, rigid conductor, lying along the x axis, carries a current of 4.0 A in the negative direction. A magnetic field B is present, given by B = 2.5i + 8.5x2 j , with x in meters and B in mT. Calculate the k-component of the force on the 2 m segmen..
A uniform thin rod of length 0.7 m and mass 3.0 kg can rotate in a horizontal plane about a vertical axis through its center. what is the bullet's speed just before impact
How many electrons would have to be added to one of these spheres to make it electrically neutral?
a current loop in a motor has an area of 1.21 cm2. it carries a 172 ma current in a uniform field of 1.42t. what is
a -10ncnbspnbspcharge is located at xnbspy 1.0cmnbsp 0nbspcm.part awhat is thenbspx-component of the electric field at
its nighttime and youve dropped your goggles into a swimming pool that is 4.0m deep. if you hold a laser pointer 1.1m
An iron casting containing a number of cavities weighs 16967.7 N in air and 13515.2 N in water. What is the total volume of all the cavities in the casting
When its engine of power 76 kW is generating full power, a small single-engine airplane with mass 680 kg gains altitude at a rate of 2.8 m/s. What fraction of the engine power is being used to make the airplane climb
The resistivity of the body is a good measure of its overall composition. A measure of the resistance of the upper arm is a good way to estimate the percent fat in a person's body. what is the maximum voltage that could be employed
Imagine a landing craft approaching the surface of Callisto, one of Jupiter's moons. What is the weight of the landing craft in the vicinity of Callisto's surface
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