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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 203115 times)

Offline Moonlyte

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1905 on: May 26, 2010, 02:02:32 pm »
Quote from: Ari Ben Canaan on May 26, 2010, 02:00:24 pm
When posting click on additional options ;)

thanks!
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holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1906 on: May 26, 2010, 02:04:02 pm »
Please help me with Lenz Law. I dont understand it  :'( :'(
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Offline Fastal

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1907 on: May 26, 2010, 02:04:55 pm »
Quote from: Ari Ben Canaan on May 26, 2010, 02:04:02 pm
Please help me with Lenz Law. I dont understand it  :'( :'(

reply #1904 :)
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Offline The Golden Girl =D

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1908 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
 ??? ??? ??? :-\ :-\
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1909 on: May 26, 2010, 02:07:05 pm »
Quote from: Ari Ben Canaan on May 26, 2010, 01:54:39 pm
I DONT GET LENZ's LAW  !!!!!



Please explain with a diagram how to predict which way the current flows with Lenz Law

 :'( :'( :'(
Quote from: Ari Ben Canaan on May 26, 2010, 02:04:02 pm
Please help me with Lenz Law. I dont understand it  :'( :'(

http://www.youtube.com/watch?v=kU6NSh7hr7Q&feature=related


DUDE CHECK THIS ONE OUT ..IM TELLIN' YA !!
« Last Edit: May 26, 2010, 02:11:08 pm by ~VIN1094~ »
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Offline Raywin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1910 on: May 26, 2010, 02:07:29 pm »
Quote from: Ari Ben Canaan on May 26, 2010, 02:04:02 pm
Please help me with Lenz Law. I dont understand it  :'( :'(

Check this website out. It has a good animation. http://www.launc.tased.edu.au/online/sciences/physics/Lenz's.html It might help.
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Offline ambitious94

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1911 on: May 26, 2010, 02:08:50 pm »
Quote from: Ari Ben Canaan on May 26, 2010, 02:04:02 pm
Please help me with Lenz Law. I dont understand it  :'( :'(
OH MAN..what did i right that whole story for on Page 127 >.< :P
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Offline Moonlyte

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1912 on: May 26, 2010, 02:12:09 pm »
Is my diagram correct for Jun 2007 No. 8?
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Offline anonymous7

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1913 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?
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Offline Weaam

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1914 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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holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1915 on: May 26, 2010, 02:19:00 pm »
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?


Go here:

http://thenightdreamer.wordpress.com/2010/01/23/rutherford-scattering/

http://thenightdreamer.wordpress.com/2010/01/23/radioactive-decay/


PS : The website is mine. :) Vote or subscribe !!!
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Offline tunnellord

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1916 on: May 26, 2010, 02:19:54 pm »
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
    


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.
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Offline Raywin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1917 on: May 26, 2010, 02:20:33 pm »
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 :-\

Black is a better absorber. BUT good absorbers are GOOD EMITTERS. Silver doesnt emit. It reflects.
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Offline Moonlyte

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1918 on: May 26, 2010, 02:23:55 pm »
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?

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.
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1919 on: May 26, 2010, 02:24:24 pm »
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
 ??? ??? ??? :-\ :-\


are you confusing yourself with mechanical waves and light rays ??

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