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Several South Indian states raise 2-3 cr...

Several South Indian states raise 2-3 crops of rice annually. The agromatic feature that makes this possible is because of

A

shorter rice plant

B

better irrigation facilities

C

early yielding rice variety

D

disease resistance rice variety.

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The correct Answer is:
C
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It is tempting to think that all possible transitions are permissible, and that an atomic spectrum arises from the transition of the electron from any initial orbital to any other orbital. However, this is not so, because a photon has an intrinsic spin angular momentum of sqrt2 (h)/(2pi) corresponding to S = 1 although it has no charge and no rest mass. On the other hand, an electron has got two types of angular momentum : Orbital angular momentum, L=sqrt(l(l+1))h/(2pi) and spin angular momentum, arising from orbital motion and spin motion of electron respectively. The change in angular momentum of the electron during any electronic transition must compensate for the angular momentum carries away by the photon. to satisfy this condition the difference between the azimuthal quantum numbers of the orbital within which transition takes place must differ by one. Thus, an electron in a d-orbital (1 = 2) cannot make a transition into an s = orbital (I = 0) because the photon cannot carry away enough angular momentum. An electron as is well known, possess four quantum numbers n, I, m and s. Out of these four I determines the magnitude of orbital angular momentum (mentioned above) while (2n m determines its z-components as m((h)/(2pi)) the permissible values of only integers right from -1 to + l. While those for I are also integers starting from 0 to (n − 1). The values of I denotes the sub shell. For I = 0, 1, 2, 3, 4,..... the sub-shells are denoted by the symbols s, p, d, f, g, .... respectively The orbital angular momentum of an electron in p-orbital makes an angle of 45^@ from Z-axis. Hence Z-component of orbital angular momentum of election is :

It is tempting to think that all possible transitions are permissible, and that an atomic spectrum arises from the transition of the electron from any initial orbital to any other orbital. However, this is not so, because a photon has an intrinsic spin angular momentum of sqrt2 (h)/(2pi) corresponding to S = 1 although it has no charge and no rest mass. On the other hand, an electron has got two types of angular momentum : Orbital angular momentum, L=sqrt(l(l+1))h/(2pi) and spin angular momentum, arising from orbital motion and spin motion of electron respectively. The change in angular momentum of the electron during any electronic transition must compensate for the angular momentum carries away by the photon. to satisfy this condition the difference between the azimuthal quantum numbers of the orbital within which transition takes place must differ by one. Thus, an electron in a d-orbital (1 = 2) cannot make a transition into an s = orbital (I = 0) because the photon cannot carry away enough angular momentum. An electron as is well known, possess four quantum numbers n, I, m and s. Out of these four I determines the magnitude of orbital angular momentum (mentioned above) while (2n m determines its z-components as m((h)/(2pi)) he permissible values of only integers right from -1 to + l. While those for I are also integers starting from 0 to (n − 1). The values of I denotes the sub shell. For I = 0, 1, 2, 3, 4,..... the sub-shells are denoted by the symbols s, p, d, f, g, .... respectively The maximum orbital angular momentum of an electron with n= 5 is

It is tempting to think that all possible transitions are permissible, and that an atomic spectrum arises from the transition of the electron from any initial orbital to any other orbital. However, this is not so, because a photon has an intrinsic spin angular momentum of sqrt2 (h)/(2pi) corresponding to S = 1 although it has no charge and no rest mass. On the other hand, an electron has got two types of angular momentum : Orbital angular momentum, L=sqrt(l(l+1))h/(2pi) and spin angular momentum, arising from orbital motion and spin motion of electron respectively. The change in angular momentum of the electron during any electronic transition mush compensate for the angular momentum carries away by the photon. to satisfy this condition the difference between the azimuthal quantum numbers of the orbital within which transition takes place must differ by one. Thus, an electron in a d-orbital (1 = 2) cannot make a transition into an s = orbital (I = 0) because the photon cannot carry away enough angular momentum. An electron as is well known, possess four quantum numbers n, I, m and s. Out of these four I determines the magnitude of orbital angular momentum (mentioned above) while (2n m determines its z-components as m((h)/(2pi)) the permissible values of only integers right from -1 to + l. While those for I are also integers starting from 0 to (n − 1). The values of I denotes the sub shell. For I = 0, 1, 2, 3, 4,..... the sub-shells are denoted by the symbols s, p, d, f, g, .... respectively The spin-only magnetic moment of free ion is sqrt(8) B.M. The spin angular momentum of electron will be

Consider a cycle followed by an engine 1 to 2 is isothermal 2 to 3 is adiabatic 3 to 1 is adiabatic such a process does not exist because a) heat is completely converted to mechanical energy in such a process, which is not possible b) mechanical energy is completely converted to heat in this process, which is not possible c) curves representing two adiabatic processes don't intersect d) curves representing an adiabatic process and an isothermal process don't intersect

AAKASH SERIES-STRATEGIES FOR ENHENCEMENT IN FOOD PRODUCTION-EXERCISE-II
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  2. Sonalika and Kalyan Sona are varieties of

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  3. Several South Indian states raise 2-3 crops of rice annually. The agro...

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  4. Which one of the following cobination would a sugarcane farmer look fo...

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  5. Use of certain chemical and radiations to change the base sequences of...

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  6. The scientific process by which crop plants are enriched with certein ...

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  7. The biggest constraints of plant breeding is:

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  8. 33 precent of India's (Gross Domastic Product) comes from

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  9. Select the eight feature related to emasculation I) It is done a mal...

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  10. Scientific knowledge and field technique are necessary to carryout ...

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  11. During hybridization procedure, bagging is necessary for I) Emascula...

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  12. Emasculation is not necessary in I) Plant with male bisexual flowers...

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  13. Which of the following are the product o single parent? (I) Clone (I...

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  14. Arrang the following steps of hybridization procedure in as sequence ...

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  15. Identify the correct sequence of events in relation to the procedure o...

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  16. Match the following The correct match is

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  17. No change in the genotype of the varieties is observed in the followin...

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  18. Genotype of the plants remain the same throughout the breeding period ...

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  19. Which of the following varieties can be develped through clonal select...

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