A point source emitting alpha particles is placed at a distance of 1 m from a counter which records any alpha particle falling on its `1 cm^2`window. If the source contains `6.0xx10^16`active nuclei and the counter records a rate of 50000 counts//second, find the decay constant. Assume that the source emits alpha particles fall nearly normally on the window.

Consider a point sorce emiiting alpha - particles and receptor and receptor of area 1 cm^(2) placed 1m away from source. Receptor records any alpha -particle falling on it. If the contains N_(0) = 3.0 xx 10^(16) active nuclie and the receptor records a rate of A = 50000 "counts"//"second" . Assume that the source emits alpha particles unifomrly in all direction and the alpha particles fall nearly normally on the window. If decay constant is 3n xx 10^(-(n+1)) , then the value of n

Consider a point sorce emiiting alpha - particles and receptor and receptor of area 1 cm^(2) placed 1m away from source. Receptor records any alpha -particle falling on it. If the contains N_(0) = 3.0 xx 10^(16) active nuclie and the receptor records a rate of A = 50000 "counts"//"second" . Assume that the source emits alpha particles unifomrly in all direction and the alpha particles fall nearly normally on the window. If decay constant is 3n xx 10^(-(n+1)) , then the value of n

A Geiger counter is placed at a distance of 5 m from a gamma radiation source. The half-life of gamma radiation source is 40 minutes and the count rate recorded by the Geiger counter is 400 s^(-1) . If the distance between the source and the counter is changed, then the count rate recorded will be 10s^(-1) after 2 hours. Find the new distance between the source and the counter.

The nucleus of an atom of ._(92)Y^(235) initially at rest decays by emitting an alpha particle. The binding energy per nucleon of parent and dougther nuclei are 7.8MeV and 7.835MeV respectively and that of alpha particles is 7.07MeV//"nucleon" . Assuming the dougther nucleus to be formed in the unexcited state and neglecting its share of energy in the reaction, calculate speed of emitted alpha particle. Take mass of alpha particle to be 6.68xx10^(-27)kg .

The nucleus of an atom of ._(92)Y^(235) initially at rest decays by emitting an alpha particle. The binding energy per nucleon of parent and dougther nuclei are 7.8MeV and 7.835MeV respectively and that of alpha particles is 7.07MeV//"nucleon". Assuming the dougther nucleus to be formed in the unexcited state and neglecting its share of energy in the reaction, calculate speed of emitted alpha particle. Take mass of alpha particle to be 6.68xx10^(-27)kg .

A small plate of a metal is placed at a distance of 2m from a monochromatic light source of wavelenght 4.8xx10^(-7)m and power 1.0 Watt. The light falls normally on the plate. Find the number of photons striking the metal plate per square metre per second.

A small plate of a metal is placed at a distance of 2m from a monochromatic light source of wavelenght 4.8xx10^(-7)m and power 1.0 Watt. The light falls normally on the plate. Find the number of photons striking the metal plate per square metre per second.

A point source of gamma - radiatonhas a half-life of 30 minutes.The intitial count rate recorded by Geiger counter placed 2 m from the source is 360 s^(-1) .The distnace between the counter and the source is altered.After 1.5 hours,the count rate recorded is 5 s^(-1) .What is th new distnace between the counter and the source?

Using a nuclear counter the count rate of emitted particles from a radioactive source is measured. At t = 0 seconds it was 25600 counts per second and t = 8 seconds it was 100 counts per second. The count rate observed, as counts per second, at t = 6 seconds is close to: