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Densitratio oO2 and H2 is16:1.The ratio of their rmvelocitiewill be-

  1. 4 :1    
  2. 1 :16    
  3. 1 :4    
  4. 16:1    

The correct answer is: 1 :4

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Related Questions to study

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In the figure, an air lens of radii of curvature 10 cm (R subscript 1 end subscript = R subscript 2 end subscript = 10 cm) is cut in a cylinder of glassleft parenthesis mu equals 1.5 right parenthesis. The focal length and the nature of the lens is

fraction numerator 1 over denominator f end fraction equals open parentheses g mu subscript a end subscript minus 1 close parentheses open parentheses fraction numerator 1 over denominator R subscript 1 end subscript end fraction minus fraction numerator 1 over denominator R subscript 2 end subscript end fraction close parentheses equals open parentheses fraction numerator 2 over denominator 3 end fraction minus 1 close parentheses open parentheses fraction numerator 2 over denominator 10 end fraction close parentheses
rightwards double arrow f equals negative 15 c m, so behaves as concave lens.

In the figure, an air lens of radii of curvature 10 cm (R subscript 1 end subscript = R subscript 2 end subscript = 10 cm) is cut in a cylinder of glassleft parenthesis mu equals 1.5 right parenthesis. The focal length and the nature of the lens is

physics-General
fraction numerator 1 over denominator f end fraction equals open parentheses g mu subscript a end subscript minus 1 close parentheses open parentheses fraction numerator 1 over denominator R subscript 1 end subscript end fraction minus fraction numerator 1 over denominator R subscript 2 end subscript end fraction close parentheses equals open parentheses fraction numerator 2 over denominator 3 end fraction minus 1 close parentheses open parentheses fraction numerator 2 over denominator 10 end fraction close parentheses
rightwards double arrow f equals negative 15 c m, so behaves as concave lens.
General
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If the central portion of a convex lens is wrapped in black paper as shown in the figure

Since aperture of lens reduces so brightness will reduce but their will be no effect on size of image.

If the central portion of a convex lens is wrapped in black paper as shown in the figure

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Since aperture of lens reduces so brightness will reduce but their will be no effect on size of image.
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At a given temperature ρ(X) = (Y) and M(X), where ρ and M stand M(Y) = 3 respectivelfodensity anmolar mass othe gases X and Y, then thratio of their pressures wilbe -

At a given temperature ρ(X) = (Y) and M(X), where ρ and M stand M(Y) = 3 respectivelfodensity anmolar mass othe gases X and Y, then thratio of their pressures wilbe -

chemistry-General
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Thdensitof a gas at 27°Cand1atm pressure is ρ. Pressure remaining constant, the temperature at which its density is 0.5 ρis-

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chemistry-General
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An object is placed at a distance of f over 2from a convex lens. The image will be

fraction numerator 1 over denominator f end fraction equals fraction numerator 1 over denominator v end fraction minus fraction numerator 1 over denominator u end fraction (Given u equals fraction numerator negative f over denominator 2 end fraction)
rightwards double arrow fraction numerator 1 over denominator f end fraction equals fraction numerator 1 over denominator v end fraction plus open parentheses fraction numerator 1 over denominator f divided by 2 end fraction close parentheses rightwards double arrow fraction numerator 1 over denominator v end fraction equals fraction numerator 1 over denominator f end fraction minus fraction numerator 2 over denominator f end fraction
rightwards double arrow fraction numerator 1 over denominator v end fraction equals fraction numerator negative 1 over denominator f end fraction and m equals fraction numerator v over denominator u end fraction equals fraction numerator f over denominator f divided by 2 end fraction equals 2
So virtual at the focus and of double size.

An object is placed at a distance of f over 2from a convex lens. The image will be

physics-General
fraction numerator 1 over denominator f end fraction equals fraction numerator 1 over denominator v end fraction minus fraction numerator 1 over denominator u end fraction (Given u equals fraction numerator negative f over denominator 2 end fraction)
rightwards double arrow fraction numerator 1 over denominator f end fraction equals fraction numerator 1 over denominator v end fraction plus open parentheses fraction numerator 1 over denominator f divided by 2 end fraction close parentheses rightwards double arrow fraction numerator 1 over denominator v end fraction equals fraction numerator 1 over denominator f end fraction minus fraction numerator 2 over denominator f end fraction
rightwards double arrow fraction numerator 1 over denominator v end fraction equals fraction numerator negative 1 over denominator f end fraction and m equals fraction numerator v over denominator u end fraction equals fraction numerator f over denominator f divided by 2 end fraction equals 2
So virtual at the focus and of double size.
General
physics-

The ray diagram could be correct

If n subscript l end subscript greater than n subscript g end subscript then the lens will be in more denser medium. Hence its nature will change and the convex lens will behave like a concave lens.

The ray diagram could be correct

physics-General
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Glycerol on oxidation with bismuth nitrate mainly gives:

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chemistry-General
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Anisole is the product obtained from phenol by the reaction known as

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Anisole is the product obtained from phenol by the reaction known as

chemistry-General
In presence of N a O H space o r space K O H comma space phenol reacts with alkyl halide and gives phenolic ether left parenthesis C subscript 6 H subscript 5 O R right parenthesis. C subscript 6 H subscript 5 O H plus N a O H not stretchy ⟶ for negative H subscript 2 O of C subscript 6 H subscript 5 O minus N a stack not stretchy ⟶ with R X on top with negative N a X below C subscript 6 H subscript 5 minus O minus R Vapours of C subscript 6 H subscript 5 O H space a n d space C H subscript 3 O H comma with red hot T h O subscript 2 (thoria) give anisole (phenolic ether). 
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chemistry-

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chemistry-General
General
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chemistry-General
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A convex lens makes a real image 4 cm long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on the screen which is 16 cm tall. The length of the object must be

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A convex lens makes a real image 4 cm long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on the screen which is 16 cm tall. The length of the object must be

physics-General
O equals square root of I subscript 1 end subscript I subscript 2 end subscript end root equals square root of 4 cross times 16 end root equals 8 c m
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physics-

The slit of a collimator is illuminated by a source as shown in the adjoining figures. The distance between the slit S and the collimating lens L is equal to the focal length of the lens. The correct direction of the emergent beam will be as shown in figure

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In case of convex lens if rays are coming from the focus, then the emergent rays after refraction are parallel to principal axis.