Atomic and Nuclear Physics Answers

The work function of a metal is 4.65ev and the metal is illuminated with a radiation of 6.86ev. what is the kinetic energy of the electron ejected from the surface of the metal

Dmitri Mendeleev is often regarded as the Father of the Periodic Table. Would you say that Henry Moseley deserves the recognition more than him?

Calculate the total number of atoms and total mass of 99mTc present in 15 mCi (555 MBq) 99mTc activity (t1/2 = 6 h).

A sample of material contains 1 microgram of iodine-131. Note that, iodine-131 plays a major role as a radioactive isotope present in nuclear and it a major contributor to the health hazards when released into the atmosphere during an accident. Iodine-131 has a half-life of 8.02 days.

a)The number of iodine-131 atoms initially present.

b)The activity of the iodine-131 in curies.

c)The number of iodine-131 atoms that will remain in 50 days.

d)The time it will take for the activity to reach 0.1 mCi.

1.    A radioactive sample with a half-life of  3hrs contains 25-mCi radioactivity. The radioactivity of the sample after 9 days days would be?

2.1.    A sample of material contains 1 microgram of iodine-131. Note that, iodine-131 plays a major role as a radioactive isotope present in nuclear and it a major contributor to the health hazards when released into the atmosphere during an accident. Iodine-131 has a half-life of 8.02 days.

a)The number of iodine-131 atoms initially present.

b)The activity of the iodine-131 in curies.

c)The number of iodine-131 atoms that will remain in 50 days.

d)The time it will take for the activity to reach 0.1 mCi.

solve a uniformly capillary tube closed at one end contain dry air trapped by a thread of mecury 8.5*10m long. when the tube was held horizontally the length of the air column was 5.0^-2m when it was held vertically with the closed end downward length was 4.5*10^-2m determine the value of atmosphere pressure ( g=10m/s^-2) density of mecury 1.36*104kgm^-3

What normal force does a horizontal table exert on a 3.5kg book that sits at rest?

A 1200 kg car accelerates at 3 m/s

2

. What net force is the car experiencing during this acceleration?