Atomic and Nuclear Physics Answers

derivation of black disk scattering in the nuclear reaction.

A solid metal cube of side 10cm is heated from 10degree to 60degree,if the linear expansivity of the metal is 1.2 multiplie by 10 raised to power -5 Kelvin raised to power -1, calculate the increase in it's volume.

A 280 day old radioactive substance shows an activity of 6000 dps , 140 days later its activity becomes 3000 dps . What was its initial activity ? (A) 20000 dps (B ) 24000 dps (C) 12000dps (D) 6000 dps

living matter has an activity of 260 bq/kg due to carbon 14. if a sample of wood from burial site has an activity of 155 bq/kg, estimate the age of the site. half-life of carbon 14 is 5730 years

An electron with KE of 2keV collided with a positron at rest creating two photons that have equal energy. Show that the energy of each photon is 8.2{times 10}-14J

An object starts from rest and accelerates for 0.24 meter per second square for 2 minutes and continues at a steady speed for 3 minutes and slow down to stop for 1 minute. a. Draw graph for the motion. b. Calculate the maximum velocity in km/hr. c. Determine the retardation. d. find the displacement in 5 minutes.

Carbon dating is used to determine the age of dead organic materials.The process uses radioactive carbon-14, which has half-life of around 6000 years.
Scientists are studying a mammoth found frozen in ice. They find that a sample of carbon from the remains has a count-rate of 200 counts per minute. When the mammoth died, the count-rate would have been 800 counts per minute. A second set of remains is found that are 18000 years older than the first set of remains. Calculate the count-rate of the second sample.

Bohr atomic model limitation

A body is left free at height h= 19.6m ( with initial velocity v0= 0 ) . What is the path covered by the body . 1) in initial time interval t1 = 0.1 s
2) and during the time period t2 = 0.1 s just before striking the ground ?

from a balloon which is at height H= 300m above the ground a stone is left to fall freely . How long will it take for the stone to reach the ground 1) balloon is moving up at velocity v= 5m/s 2) balloon is moving down at velocity v= 5m/s 3) balloon is motionless