A series of different radioactive isotopes are placed, one at a time, in a lead

Question

A series of different radioactive isotopes are placed, one at a time, in a lead box (shown in the lower right comer of the picture at the right). Any radiated alpha (alpha), beta (beta), or gamma (gamma) particles from the isotopes are permitted to travel out through a pipe on the upper left side. (This pipe aims directly at the "C" radiation detector.) Outside of the pipe, any radiated particles are immediately exposed to a magnetic field pointing in the vertically downward direction. Different types of radiation will be affected differently by the magnetic field, sending the radiated particles toward any one of 5 radiation detectors, labeled A - E. Remember: F vector = q v times B = m a = mv/r r Which detector picks up which particles? a. A detects alpha (alpha), B detects beta (beta), and C detects gamma (gamma). b. B detects alpha (alpha), E detects beta (beta), and C detects gamma (gamma). c. D detects alpha (alpha), A detects beta (beta), and C detects gamma (gamma). d. C detects alpha (alpha), D detects beta (beta), and A detects gamma (gamma). e. C detects all of the particles exclusively. Believe it or not, there are some board games which require 30-sided dice! Let's say that we use 100 of these dice to model radioactive decay. We put all 100 of the dice into a box and shake them around. After each shake, we allow the dice to settle and then remove all the dice which display any number between 1 and 7. We make a careful note of the number of remaining dice and then shake the box again. The process repeats until 110 more dice remain. Using "shakes" as our time unit, what is the half life of our dice model? a. 2.6 shakes b. 1.4 shakes c. 0.48 shakes d. 0.26 shakes I have a great deal of faith in science to provide all of as with a greater appreciation for everything in the world. 1 have faith that science will take humanity to great places. And with this comes a faith in humanity to do the right thing when needed. However, one thing science and technology should never do is make us think we can delegate our faith ... our opinions ... our morality ... to others, for then, we're just sheep. Remember: people tend to fill the gaps in knowledge with opinion ... not necessarily their own. Stand for nothing, and you will fall for anything. Become the change you want to see. Knowledge IS power. I'm glad to have had the opportunity to share with you my love of science and I hope you've enjoyed the course. Good students make it easy. If you have a chance to apply what you've learned to something important in your life, I will have done my job. And you never know. After all, physics is everywhere. Have a Safe and Fun Summer! -STR

Explanation / Answer

Q1.

                As F=q (V* B) , applying right hand curl rule to determine direction of particles deflection in magnetic field.

As particles carry positive charge, the will be deflected towards the detectors A and B.

particles carry negative charges, so they will deflect towards detector D and E.

as gamma particle has no charge , it will not deflect in magnetic field. Gamma particles are detected by detector C.

Hence correct option is (b).

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