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From: haroonamanReply 41 of 54Reply
Subject: Contributed Answer/Explanation to Q. 39
   The angular deviation of the emergent ray from the glass block with respect
   to the incident ray is the same as the ray comes from one medium back to the
   same medium.

Posted at: Sun Feb 28 18:43:43 2010 (GMT)

From: haroonamanReply 42 of 54Reply
Subject: Contributed Answer/Explanation to Q. 8
   The term f - number is also known as the focal number and is a point where
   the distance of the image from the lens is equal to the distance from the
   object. In such a type of an image the image is of the same size as the
   object.

Posted at: Mon Mar 1 01:14:37 2010 (GMT)

From: haroonamanReply 43 of 54Reply
Subject: Contributed Answer/Explanation to Q. 57
    The equation for it is :
   27Mg12 ----(alpha)---->  27-4Mg12-2 ---(beta)--->  23Mg10+1 ------> 
   23Mg11 .

Posted at: Mon Mar 1 02:04:48 2010 (GMT)

From: haroonamanReply 44 of 54Reply
Subject: Contributed Answer/Explanation to Q. 59
   Uranium

Posted at: Mon Mar 1 02:08:08 2010 (GMT)

From: haroonamanReply 45 of 54Reply
Subject: Contributed Answer/Explanation to Q. 60
   We must always wear lead armours and should wear lead hloves ,he should not
   be allowed to be exposed to the radiations for a long time. The radioactive
   substance should be handled by lead tongs

Posted at: Mon Mar 1 02:15:32 2010 (GMT)

From: snehald27Reply 46 of 54Reply         View replies (1)
Subject: Contributed Answer/Explanation to Q. 26
   pliers

Posted at: Sun Mar 21 07:02:08 2010 (GMT)

From: snehald27Reply 47 of 54Reply
Subject: Contributed Answer/Explanation to Q. 26
   scissors
   when the effort arm of scissors are smaller its M.A. is less than 1 

Posted at: Sun Mar 21 07:08:01 2010 (GMT)

From: snehald27Reply 48 of 54Reply
Subject: Contributed Answer/Explanation to Q. 27
   gain in speed
   in 1 and 3 class levers,we can see mechanical advantage less than 1 and
   because of this we do not gat force but gain in speed..

Posted at: Sun Mar 21 07:11:40 2010 (GMT)

From: harsimranReply 49 of 54Reply
Subject: Contributed Answer/Explanation to Q. 27
   gain in speed

Posted at: Mon Sep 27 13:47:13 2010 (GMT)

From: harsimranReply 50 of 54Reply
Subject: Contributed Answer/Explanation to Q. 5
   when the temperature is decreased the density increases so the floats on the
   surface.

Posted at: Mon Sep 27 13:54:11 2010 (GMT)

From: harsimranReply 51 of 54Reply
Subject: Contributed Answer/Explanation to Q. 34
   due to tension in the string

Posted at: Mon Sep 27 13:58:58 2010 (GMT)

From: harsimranReply 52 of 54Reply
Subject: Contributed Answer/Explanation to Q. 35
   no
   because there is no atmosphere on the moon and so the sound waves cannot
   propagate as they require a material medium for propagation.

Posted at: Mon Sep 27 14:00:36 2010 (GMT)

From: harsimranReply 53 of 54Reply
Subject: Contributed Answer/Explanation to Q. 41
   1

Posted at: Mon Sep 27 14:01:58 2010 (GMT)

From: harsimranReply 54 of 54Reply
Subject: Contributed Answer/Explanation to Q. 58
   it is-
   23Mg11

Posted at: Mon Sep 27 14:08:38 2010 (GMT)

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