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Physics, Chemistry and Biology: Post your doubts here!

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question number 6,9 and 11 need the answers and explanation to them as well
 

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I have a physics doubt... hope u can solve it for me...!

A tsunami is a giant water wave. It may be caused by an earthquake below the ocean. Waves from a certain tsunami have a wavelength of 1.9*10^5 m and a speed of 240m/s. The shock wave from the earthquake travels at 2.5*10^3 m/s. The center of the earthquake is 6.0*10^5 m from the coast of a country. Calculate how much warning of the arrival of the tsunami at the coast if given by the earth tremor felt at the coast.
 
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What type of questions generally come for organic chemistry ?? What all do we need to know?
in ppr 3 all structural formulas r asked.........u neeed to all functional groups,all links,combustion of a named hydrcarbon.differenciation between addition and condensation polymerisation.drawing monomers and polymers.hope this is helpful........:)
 
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question number 6,9 and 11 need the answers and explanation to them as well
6.a)For O: its a mirror so d image shud b approx. d same dist. on d right of d mirror as O is to d right
For P: P is between focus n lens, so virtual image is formed
b)i)If the rays do not actually converge but appear to come from the image point, the image is called virtual. it cannot b captured on a screen
ii) both r erect, ie. dey arent vertically inverted
iii)d image in d mirror is on d oder side bt fr d lens its on d same side

9.a) it is when a magnetic field is cut by a conductor and an e.m.f is generated
b)sumwhat lyk dis
download.jpg
c) when moving a magnet in and out of d solenoid, der is a deflection on d meter
d) move magnet faster
use a stronger magnet

11.a)a bit confusing
i. take d background radiation n record its value
ii. place d beta source n take d readin on d counter
iii. repeat with placin 1 sheet of Al each tym
iv. subtract back. radiation frm oder readings

b)count reduces as thickness increases n finally no b-particles can penetrate,ie. back. radiation value
 
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I have a physics doubt... hope u can solve it for me...!

A tsunami is a giant water wave. It may be caused by an earthquake below the ocean. Waves from a certain tsunami have a wavelength of 1.9*10^5 m and a speed of 240m/s. The shock wave from the earthquake travels at 2.5*10^3 m/s. The center of the earthquake is 6.0*10^5 m from the coast of a country. Calculate how much warning of the arrival of the tsunami at the coast if given by the earth tremor felt at the coast.
time taken fr tremor:6 *10^5/2.5*10^3 = 240s
=>time fr tsunami = 6*10^5/240 = 2500s
warning tym = time fr tsunami - time fr tremor = 2500 - 240 = 2260s
i hope its correct
 
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Two draw isomers, you need to take these three things into account:

1- Position of a functional group
2- Changing the functional group using the given atoms
3- Changing the chain structure

That gives you at least three different isomers every time.
 
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guys whats should be the valencies for the transition metals? i know that each element have different valences, but whats the valency that we should use in solving equations for example? as i remember they were 2 or 3 but silver is 1 ??
 
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guys whats should be the valencies for the transition metals? i know that each element have different valences, but whats the valency that we should use in solving equations for example? as i remember they were 2 or 3 but silver is 1 ??
For transition metals valency consider the roman numer in brackets as a valency..dont predict valency tht u hv read somewhere
 
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thnx :) . sorry but how to calculate the Empirical Formula ??
First note down the mass of rach element seperately.then divide it by Mr tht u find in periodic table.
There are chances tht the value is in decimal like 0.25:0.5
In this divide both of thm by least no. that is 0.25.u should not hv answer of this ratio in decimal so balance it accordingly.
Hope this helps
 
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