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[A]: Maximum genetic diversity of crop p...

[A]: Maximum genetic diversity of crop plants is found in areas where agriculture is primitive.
[R]: In such primitive areas, human interference is minimum and maximum flora and fauna survive

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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The correct Answer is:
A
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When waves from two coherent source of amplitudes a and b superimpose , the amplitude R of the resultant wave is given by R = sqrt(a^(2)+b^(2)+2ab cos phi). where phi is the constant phase angle between the two waves. The resultant intensity I is directly proportional to the square of the amplitude of the resultant wave i.e I prop R^(2) i.e, I prop (a^(2) +b^(2) +2ab cos phi ) For constructive interference , phi = 2n pi " ""and"" " I _("max") = (a+b)^(2) For destructive interference , phi = (2n-1) pi "and" I_("min") = (a-b)^(2) If I_(1) I_(2) are intensities from two slits of width w_(1) "and" w_(2) then I_(1)/I_(2)=w_(1)/w_(2)=a^(2)/b^(2) Light waves from two coherent sources of intensity ratio 81 : 1 produce interference. With the help of the passage choose the most appropriate alternative for each of the following questions If two slits in Young's experiment have width ratio 1:4 the ratio of maximum and minimum intensity in the interference pattern would be

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TRUEMAN BIOLOGY-Applications of Biology -ASSERTION AND REASON
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  10. [A]: In alcoholic drink the alcohol is converted into glucose in liver...

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  11. (A]: The neem is used as a natural insecticide. [R]: The extract ...

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  12. Assertion : There is no chance of transmission of malaria to a man on ...

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  13. [A]: Treatment of malaria by vaccination is rare [R]: Plasmodium do...

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  14. [A]: B-cells are responsible for antibody mediated immunity which dire...

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  15. [A]: lmmunoglobulins or antibodies are specilialized proteins synthesi...

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