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| From: haroonaman | Reply 41 of 54 | Reply | |
| 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)
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| From: haroonaman | Reply 42 of 54 | Reply | |
| 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)
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| From: haroonaman | Reply 43 of 54 | Reply | |
| 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)
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| From: haroonaman | Reply 44 of 54 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 59 |
Uranium
Posted at: Mon Mar 1 02:08:08 2010 (GMT)
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| From: haroonaman | Reply 45 of 54 | Reply | |
| 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)
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| From: snehald27 | Reply 46 of 54 | Reply | View replies (1)
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| Subject: Contributed Answer/Explanation to Q. 26 |
pliers
Posted at: Sun Mar 21 07:02:08 2010 (GMT)
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| From: snehald27 | Reply 47 of 54 | Reply | |
| 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)
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| From: snehald27 | Reply 48 of 54 | Reply | |
| 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)
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| From: harsimran | Reply 49 of 54 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 27 |
gain in speed
Posted at: Mon Sep 27 13:47:13 2010 (GMT)
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| From: harsimran | Reply 50 of 54 | Reply | |
| 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)
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| From: harsimran | Reply 51 of 54 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 34 |
due to tension in the string
Posted at: Mon Sep 27 13:58:58 2010 (GMT)
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| From: harsimran | Reply 52 of 54 | Reply | |
| 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)
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| From: harsimran | Reply 53 of 54 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 41 |
1
Posted at: Mon Sep 27 14:01:58 2010 (GMT)
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| From: harsimran | Reply 54 of 54 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 58 |
it is-
23Mg11
Posted at: Mon Sep 27 14:08:38 2010 (GMT)
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