, 10.08.2021 20:10 nathaliapachon1254

E (c) Technetium-99m has a half-life of 6 hours.Home work.A sample of technetium-99m has an activity of 420 MBq.(i) Explain why the activity of a radioactive sample reduces with time.(ii) Calculate the activity of the technetium-99m sample after 24 hours.

pe = weightxheight = 2000x1000=2,000,000joules

wavelegth as in spectrum red oygbiv

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol

b. a hockey puck sliding across the ice

c. a compressed spring

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.

at right angles to each other

Another question on Physics

Physics, 22.06.2019 00:00
What should the power status of a circuit be when measuring resistance with an ohmmeter?
Physics, 22.06.2019 09:00
Yvette hangs a 2.4kg bird feeder in the middle of a rope tied between two trees. the feeder creates a tension of 480 n in each side of the the rope.