Atomic and Nuclear Physics Answers

sir... why should we take shell K L M N letters in Neels bhors experiment not A B C D s

is shadow is a matter?

what are types of absorption coefficient?
what are the parameters which absorption coefficient dependence on?
Can make alpha, beta and gamma rays energies approaching to zero?

what is the maximuim energy resolution in percent necessary to resolve two peaks at 720 KeV and 755 KeV?

Radioactive isotopes used in cancer therapy have a "shelf- life," like pharmaceuticals used in chemotherapy. Just after it has been manufactured in a nuclear reactor, the activity of a sample of 60co is 5000 Ci. When its activity falls below 3500 Ci, it is considered too weak a source to use in treatment. You work in the radiology department of a large hospital. One of these 60co sources in your inventory was manufactured on October 6, 2004. It is now April 6, 2007. Is the source still usable? The half-life of 60co is 5.271 years.
a) What is the mass of the source when it was manufactured?
b) Is this source still useable?

(a) The 210Po source used in a physics laboratory is labeled as having an activity of 1.0μCi on the date it was prepared. A student measures the radioactivity of this source with a Geiger counter and observes 1500 counts per minute. She notices that the source was prepared 120 days before her lab. What fraction of the decays is she observing with her apparatus? (b) Identify some of the reasons that only a fraction of the α s emitted are observed by the detector.

50V has one of the longest known radioactive half-lives. In a difficult experiment, a researcher found that the activity of 1.00 kg of 50V is 1.75 Bq. What is the half-life in years?

Radioactive isotopes used in cancer therapy have a "shelf- life," like pharmaceuticals used in chemotherapy. Just after it has been manufactured in a nuclear reactor, the activity of a sample of 60co is 5000 Ci. When its activity falls below 3500 Ci, it is considered too weak a source to use in treatment. You work in the radiology department of a large hospital. One of these 60co sources in your inventory was manufactured on October 6, 2004. It is now April 6, 2007. Is the source still usable? The half-life of 60co is 5.271 years.
a) What is the mass of the source when it was manufactured?
b) Is this source still useable?

a fan blade is initially rotating at an angular speed of 48.6 rpm. it slows down and eventually comes to rest in a time of 32 seconds after turning through a total of 8.8 revolutions. find the average angular velocity of the fan blade

what is the maximuim energy resolution necessary to resolve two peaks at 720 KeV and 755 KeV?