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Collect the information regarding wavele...

Collect the information regarding wavelengths and corresponding frequencies of three primary colours red, blue and green.

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Knowledge Check

  • White light forms a continuous spectrum of minimum wavelength 3800 A^@ corresponding to violet light and maximum wavelength 7800A^@ corresponding to red light. Find the minimum and maximum frequencies of white light

    A
    `3.846 times 10^14 Hz, 7.895 times 10^14 Hz`
    B
    `2.546 times 10^14 Hz, 6.985 times 10^14 Hz`
    C
    `4.846 times 10^14 Hz, 8.895 times 10^14 Hz`
    D
    `1.546 times 10^14 Hz, 5.985 times 10^14 Hz`

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    observe the below diagram showing variation in beetle population and its impact. Let us consider a group of eweleve beetles. They live in bushes on green leaves. Their population will grow by sexual reproduction. So they were able to generate variations in population. Let us assume crows eat these red beetles. If the crows eat more Red beeles, their population is slowly reduced. let us disuss the above 3 different situations in detail. A. Situation-1 : in this situation a colour variation arises during reproduction. So that there appears one beetle that is green n colour instead of red moreover this green coloured beetle passes it's colur to it's offspring (Progeny ). So that all its progeny are green. Crows cannot see the green coloured beetles on green leaves of the bushes and therefore crows cannot eat them. But crows can see the red beetles and eat them As a result there are more and more gren beetles than red ones which decrease in their number . the variation of colour in beetle green gave a survival advantage to green beetles' than red beetles. in other word it was naturaly selected. We can see that the natural selection was exerted by the crows. The more crows there are, the more red beetles would be eaten and the more number of green beetles in the population would be. thus the natural selection is directing evolution in the beetle population. it results in adaptation in the beetle population to fit in their envirnment better. Let us think of another situation. Situation-2: In this situation a colour variation occurs again in its progeny during reproducation but now it results in blue colour beetles instead of red colour beetle. this blue colour beetle can pass its colour to its progeny. So that all its progeny are blue. crows can see blue coloured beetles on the green leaves of the bushes and the red ones as well. And therefore crows can eat both red and blue coloured beetles. In this case there is no survival advantage for blue coloured beetles as we have seen in case of green coloured beetles What happens initially in the population, there are a few blue beetles, butmost are red. Imagine at this point an elephant comes by and stamps on the bushes where the beetles live. this kills most of the beetles. By chance the few beetles survived are mostly blue. Again the beetle population slowly increases. But in the beetle population most of them are in blue colour. Thus sometimes accidents may also result in changes in certain characters of the population. Characters as we know are governed by genes. Thus there is change in the frequency of genes in small populations. this is known as genetic drift, which provides diversity in the population. Situation-3: In this case beetles population is increasing, but suddently bushes were affected by a lant disease in which leaf material were destroyed or in which leaves are affected by this beetles got les food material. So beetles are poorly nourished. So the weight of beetles decrease but no changes take place in their genetic material (DNA). After a few years the plant diseases are eliminated. Bushes are healthy with plenty of leaves. (Q) What do you think will be conditin of the beetles?

    A beam of light consisting of red, green and blue colours is incident on a right-angle prism. The refractive indices of the material of the prism for the red, green and blue wavelengths are 1.39, 1.44 and 1.47 respectively. The prism will 1) separate the red colour from thegreen and blue colours 2) separate the blue colour from thered and green colours 3) separate all the three colours from one another 4) not separate even partially any colour from the other two colours.

    Four students were given colourless liquids A,B,C of water, lemon juice and a mixture of water and lemon juice respectively. After testing these liquids with pH paper, following sequences in colour change of pH paper were reported. Blue, Red and Green Orange, Green and Green Green, Red and Red Red, Red and Green

    A beam of light consisting of red, green and blue colours is incident on a right angle prism. The refractive indices of the material of the prism of the red, green and blue wavelengths are 1.39,1.44 and 1.47 respectively. The prism will 1) Separate the red colour from the green and blue colours 2) separate the blue colour from the red and green colours 3) separate all the three colours from one another 4) not separate even partially any colour from the other two colours.

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