King
  • King
A fish in an aquarium approaches the left wall at a rate of 3 m/s and observes a fly approaching it at 8 m/s. If the refractive index of water is 4/3, find the actual velocity of the fly.Explain with steps..pls help!!!:(
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
Is it 4 m/s?
King
  • King
actual velocity of fly=3.75m/s
anonymous
  • anonymous
We know that, Speed of light in air / Speed of light in water = 4/3 Or, 3 * 10^8 / x = 4/3 Or, x = 2.25 * 10^8 Now, 2.25*10^8 = 3 So, 3*10^8 = 3/(2.25 * 10^8) * 3*10^8 = 9/2.25 = 4

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anonymous
  • anonymous
Not getting how it is 3.75 m/s
King
  • King
wait hw is 2.25*10^8=3?
anonymous
  • anonymous
I just equated for the sake of unitary method, since fish is in water. It may be wrong.
anonymous
  • anonymous
|dw:1332857679054:dw|
King
  • King
ok the ray refracts twice so?
anonymous
  • anonymous
so, get me the refractive index of Glass...
King
  • King
hw?
anonymous
  • anonymous
arre book mein dheko na
King
  • King
oh..i dont hav a book mein 10th mein hoon just passed this prob is frm a sample paper
anonymous
  • anonymous
Given taht R.F. of water is 4/3. Glass refractive index = 1.52(crown glass)
King
  • King
acc. to google it is 1.52
King
  • King
yeah and fr flint glass it is 1.62
King
  • King
For the fish, the apparent distance of the fly from the wall of the aquarium is µx, where µ is the R.I. of water and x is the actual distance, then apparent velocity will be . Therefore, actual velocity of fly = (8 – 3) * (3/4) = 3.75 m/s. This is the sol. given can u explain this?
anonymous
  • anonymous
Check in 10th NCERT, crown glass' R.F. is 1.52
King
  • King
yeah i know that i just told fr flint glas it is 1.62
King
  • King
so salini,ishaan,aadarsh can a ny of u explain the above sol.?
anonymous
  • anonymous
Oh, don't consider Glass, you will have to ignore Glass, my bad :/
anonymous
  • anonymous
btw Glass can't be ignored in real life
King
  • King
ok so what to do nw?
anonymous
  • anonymous
|dw:1332858159715:dw|Apparent Velocity of fly = 8-3.
King
  • King
ok
King
  • King
why?
King
  • King
why ?
anonymous
  • anonymous
because the apparent velocity is from the frame of reference in water.
King
  • King
ok..ok yeah....
King
  • King
ok 1 more..
King
  • King
posted!
anonymous
  • anonymous
u have to have an idea abt relative velocity ie velocity of f fly with res[pect to velocity of fish(since both are moving) Vfly-Vfish=relative velocity of fly with respect to fish in water i think u can figure out the rest
anonymous
  • anonymous
IN WATER CONDITION is wat i have discussed above so do the same thing in air using R.I multiply by 3/4
King
  • King
can u pls xplain why i hav to divide by refractive index
anonymous
  • anonymous
wat is R.I? DID u understand the relative velocity part(it is nothing but how the fish sees the fly when it is moving)
King
  • King
refractive index ya i understood the r.v part
anonymous
  • anonymous
right wat is the expression?
King
  • King
expression fr wat?
anonymous
  • anonymous
refractive index of medium 1 with respect to medium 2?
King
  • King
idk
anonymous
  • anonymous
it is speed of light in medium 2/speed of light in medium 1 =r.i of medium 2 use this and put the values u
King
  • King
@salini sry gtg can u pst solution and i shall se it tom
King
  • King
bye!
anonymous
  • anonymous
thts ball u gotto work out with the expressions i gave remember it is velocity of fly in water (actual) that i gave u with relative velocity concept bye! my god this site is very slow!
anonymous
  • anonymous
|dw:1332861296812:dw|so when u do the pproblem Vmf is only given Vmf=Vm-Vf 8=Vm-(-3) that is how it is 5m/s velocity of moth in water

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