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ALL PHYSICS DOUBTS - POST HERE !!
holtadit:
--- Quote from: anonymous7 on May 26, 2010, 02:16:43 pm ---The syllabus says:
5. Atomic Physics
b) Characteristics of the three kids of emission
-describe their [alpha, beta and gamma particles] deflection in electric fields and magnetic fields.
Questions based on this is pretty popular as I have seen them in numerous papers. But I don't have any notes on them and my textbook is no help what so ever. Can anyone shed some light on it?
--- End quote ---
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tunnellord:
--- Quote ---By the way i always get mixed up in this :
when the ray enters denser medium does it move AWAY or TOWARDS the normal line
ohh
and when the ray enters deep to shallow , does it move TOWARDS or AWAY
--- End quote ---
When a ray enters a denser medium, it moves towards the normal.
What do u mean by entering deep to shallow.
do u mean entering shallow from deep or shallow to deep.
Raywin:
--- Quote from: weaam on May 26, 2010, 02:18:33 pm ---Can anyone help me understand Q5 part a (iii) M/J 0. I thought silver is a better emitter of heat and black is a better absorber, but it says opposite in the mark scheme :-\
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Black is a better absorber. BUT good absorbers are GOOD EMITTERS. Silver doesnt emit. It reflects.
Moonlyte:
--- Quote from: anonymous7 on May 26, 2010, 02:16:43 pm ---The syllabus says:
5. Atomic Physics
b) Characteristics of the three kids of emission
-describe their [alpha, beta and gamma particles] deflection in electric fields and magnetic fields.
Questions based on this is pretty popular as I have seen them in numerous papers. But I don't have any notes on them and my textbook is no help what so ever. Can anyone shed some light on it?
--- End quote ---
Magnetic Field
If a very narrow beam of radiation from a sample of radium is given out in the presence of a magnetic field in a cloud chamber, the rays will leave 3 different tracks of cloud: gamma rays keep going straight, but alpha and beta radiations curve in opposite directions.
Electric Field
Being charged particles, alpha and beta can be deflected in an electric field, but gamma rays cannot. Alpha moves towards negative plate and beta moves toward positive plate.
Vin:
--- Quote from: the golden girl on May 26, 2010, 02:06:02 pm ---By the way i always get mixed up in this :
when the ray enters denser medium does it move AWAY or TOWARDS the normal line
ohh
and when the ray enters deep to shallow , does it move TOWARDS or AWAY
??? ??? ??? :-\ :-\
--- End quote ---
are you confusing yourself with mechanical waves and light rays ??
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