During his studies on genes in Drosophila that were sex-linked T.H. Morgan found `f_2` population phenotypic ratios deviated from expected 9:3:3:1. Explain the conclusion he arrived at.

How did he disprove Mendelian dihybird F-2 phenotypic ratio of 9: 3: 3: 1? Explain giving reasons.

A true breeding tall plant is crossed with a true breeding dwarf plant. F_1 progeny is 100% tall and F_2 has tall: dwarf in the ratio 3:1 Name the patterns fo inheritance in which the ratio deviates from above. Also mention the deviated phenotypic ratio.

A mercury lamp is a convenient source for studying frequency dependence of photoelectric emission, since, it gives a number of spectral lines ranging from the UV to the red end of the visible spectrum. In our experiment with rubidium photo-cell, the following lines from a mercury source were used: lambda_1 = 3650 oversetcircA , lambda_2=4047 oversetcircA , lambda_3=4358 oversetcircA , lambda_4=5461 oversetcircA , lambda_5=6907 oversetcircA The stopping voltages respectively were measured to be V_0=1.28 V , V_0.95V , V_0=0.74V , V_0=0.16 , V_0=0V Determine the value of Planck's constant h.

A three-wheeler starts from rest, accelerates uniformly with 1 m s^-2 on a straight road for 10 s, and then moves with uniform velocity. Plot the distance covered by the vehicle during the 11th second (n = 1,2,3....) versus 11. What do you expect this plot to be during accelerated motion : a straight line or a parabola ?

The isotopes .^(238)U and .^(235)U occur in nature in the mass ratio 140 : 1. it is assumed that intially they were found in equal mass. If half life (t_(1//2)) of .^(238)U=4.5xx10^(9) and t_(1//2) of .^(235)U 7.13 x10^(8) years respectively then the age of earth is (log 7=0.846,log2=0.3)

Consider the D–T reaction (deuterium–tritium fusion) "_1^2H + "_1^3H rarr "_2^4He + n . Calculate the energy released in MeV in this reaction from the data: m( "_1^2H )=2.014102 u m( "_1^3H ) =3.016049 u

In which of the following reactions, the formation of product is favoured by decrease in temperature ? (1) N_(2)(g)+O_(2)(g)hArr2NO(g), DeltaH^(@)=181 (2) 2CO_(2)(g)hArr2CO(g)+O_(2)(g), DeltaH^(@)=566 (3) H_(2)(g)+I_(2)hArr2HI(g), DeltaH^(@)=-9.4 (4) H_(2)(g)+F_(2)(g)hArr2HF(g),DeltaH^(@)=-541