Two compounds- A and B- were separated by gas liquid chromatography-.docx

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Two compounds, A and B, were separated by gas â€“ liquid chromatography. The retention times are 628 s and 642 s, and the widths at half-height are 8.3 s and 9.4 s, correspondingly. Find the resolution for these two compounds. Are the peaks well resolved? Solution Answer: Resolution in HPLC is Rs=2(tR2-tR1)/(W1+W2) Where tR=retention time, W=peak width Given tR1=628 s, tR2=642 s, W1=8.3 s, W2=9.4 s, Rs=2x(642s - 628s)/(8.3s + 9.4s) Rs=1.58. The peaks are well resolved, since ifÂ Â R > 1.5, then peaks are completely resolved. Here Is=1.58 > 1.5, then peaks are well resolved. Thanks and I hope you like it. Please let me know if you have any doubt. .

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ty ty +x +X Solution Let, mass of each rod , m = M length of each rod , L = 7.5 m Case(a): ( with all four rods ) Total mass, m1 = 4 M X-coordinate of center of mass , X1 =0 Y-coordinate of center of mass , Y1 =0 Case (b) : ( for the removed rod ) mass, m2 = M X-coordinate of center of mass , X2 =L / 2 = 7.5 /2 = 3.75 m Y-coordinate of center of mass , Y2 =0 Center of mass of the remaining part: X-coordinate of center of mass , Xcm = (m1 X1 - m2 X2 ) / ( m1- m2 )= ( 4 M * 0 - M * 4.0 ) / ( 4 M - M ) = -1.33 m Y-coordinate of center of mass , Ycm = (m1 Y1 - m2 Y2 ) / ( m1- m2 )= ( 4 M * 0 - M * 0 ) / ( 4 M - M ) = 0 m .

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True/False (a) Ganymede is the only known satellite to have an intrinsic magnetic field T F (b) Titan has the thickest atmosphere in the solar system T F (c) The E-ring of Saturn was formed by impacts on Enceladus T F (d) Coriolis effect causes the jet streams on Jupiter T F Solution a) T Because, no other satellites have magnetic field. b) T Others also have atmosphere. But titan has thickest atmosphere. c) T d) T Jupiter rotates much faster and has a thicker atmosphere, so its coriolis effect is much stronger. .

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True or false. If true or false state your reason. 2 lanes are subspaces of R2 because: if we have y=mx and (t, mt) 1. They are closed under addition: (t, mt)+(s, ms)=(t+s, m*(t+s)) 2. They are closed under scalar multiplication: r*(t, mt)=(rt, r*(mt)) 3. Zero vector because they pass through the center of grid coordinates. These 2 lanes are isomorphic because for each x there is y1 and y2 (one-to-one). Similarly, each plane in R3 passing through origin is a subspace and has equation ax+by+cz=0. Both planes isomorphic because they also have one-to-one correspondence between points on the plane Thank you. Solution This is TRUE.....zero vector acts as the identity element....so a plane to be subspaces it need to pass through origin.....in case of y = mx the plane is passing through origin and hence it forms subspaces..... .

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true or false The Doppler effect is a change in frequency due to the relative motion of a source of sound. 27. The amplitude of the wave is the time it takes it to pass a point. 28. When light passes through a lens it bends due to the property called refraction. 29. A magnifying glass when used to enlarge letters on a page is producing a virtual image. 30. The normal hearing range is between 20 hz and 80,000 hz Solution 1) doppelr effect is true 2) amplitude is the displacement of the particle from the mean position false 3) refraction means bending nature of light it is true 4) true magnifying lens is used to see the smaller objects to larger objects 5) normal hearing range is 20 to 20000 Hz false .

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tte ? ????.rrof, tot i aoTA. South L has an anday ebretro chon Hrd dioveaa?Gnt.rou owney e e through ? tle matenal? an at as a Crudo Conver mate nau Solution 6. As the refractive index contiuously changes the direction of the light ray also changes contiuously, since when light ray enters into denser medium its direction will change. 7.Since air is optically rarer than water, the ray of light bends away from the normal at the point of incidence when moving from water to air while it bends towards the normal while moving from air to water. The normal at any point of a spherical bubble will pass through the center of the bubble. It is clearly visible that the air bag acts as a DIVERGING LENS (concave lens) in water. .

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