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a. A certain radioactive material emits gamma rays with energy 1 MeV. Another sample of radioactive material emits gamma rays with energy 10 keV. If both of these emit the same amount of energy per unit time, compare their activities.
b. A source of 198Au with a half-life of 2.69 days has an initial activity of 5 Ci. Calculate the activity after 4.0 days. Express this activity in Bq.
what is physics
Using a bicycle Turn a bicycle upside down so that it rests on the seat and handlebars. Turn the pedal wheel precisely one turn and note the number of turns made by the rear wh
In the movie The Shooter starring Mark Wahlberg, it is claimed that coriolis forces need to be taken into consideration when taking a shot at a target 4 kilometres away. To test
Why hot air rises up ?
what is the difference between diplacement and distance
Draw a free-body diagram for a submerged beach ball as it rises toward the surface just after being released. Recognize the forces acting on the beach ball and show the directi
#question
A boy is standing on an elevator which is traveling downward with a constant velocity of 30 meters per second. The boy throws a ball vertically upward with a velocity of 10 meters
EXAMPLES OF IT
The overall length of a particular wind instrument is 35.0 cm. The resonating air column vibrates as ina pipe that is open at both ends. (a) Find the frequency of the lowest not
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