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[A]: Chlorophylls usually show red fluor...

[A]: Chlorophylls usually show red fluores- cence though they absorb blue radiations as well.
[R]: In fluorescence, long wave radiations are emitted

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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A
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The french physicist Louis de Broglie in 1924 postulated that matter like radiation show a dual behaviour . He proposed the following relationship between the wavelength lambda of a material particle its linear momentum p and planck constant h lamda=h/p =h/(mv) The de broglie relation implies that the wavelength of a particle should decreases as its velocity increases . it also implies that for a given velocity heavier particles should have shorter wavelength than lighter particles. The waves associated with particles in motion are called matter waves or de broglie waves. These waves differ from the electromagnetic waves as they (i) have lower velocities (ii) have no electrical and magnetic fields and (iii) are not emitted by the particle under consideration . The experimental confirmation of the de-broglie relation was obtained when Davisson ans Germer in 1927 observed that a beam of electrons is diffracted by a nickel crystal . as diffraction a characteristics property of waves hence the beam of electron behaves as a wave, as proposed by de-broglie. If proton, electron and alpha -particle are moving with same kinetic energy then the order of de-Broglie's wavelength

The french physicist Louis de Broglie in 1924 postulated that matter like radiation show a dual behaviour . He proposed the following relationship between the wavelength lamda of a material particle its linear momentum p and planck constant h lamda=h/p =h/(mv) The de broglie relation implies that the wavelength of a particle should decreases as its velocity increases . it also implies that for a given velocity heavier particles should have shorter wavelength than lighter particles. The waves associated with particles in motion are called matter waves or de broglie waves. These waves differ from the electromagnetic waves as they (i) have lower velocities (ii) have no electrical and magnetic fields and (iii) are not emitted by the particle under consideration . The experimental confirmation of the de-broglie relation was obtained when Davisson ans Germer in 1927 observed that a beam of electrons is diffracted by a nickel crystal . as diffraction a characteristics property of waves hence the beam of electron behaves as a wave, as proposed by de-broglie. de- Broglie wavelength of an electron travelling with speed equal to 1% of the speed of light

Which among tlie following gases absorb long wavelength infrared radiation emitted from the earth’s surface-

TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
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  2. [A]: Plants growing under trees show less photosynthesis. [R]: Gree...

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  3. [A]: Chlorophylls usually show red fluores- cence though they absorb b...

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  4. Asserion : Long distance flows of photoassimilates in plants occurs t...

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  5. [A]: Rhoeo discolor leaves contain anthocya-nin in epidermal cells [...

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  6. [A]: Ringing/Girdling experiments involved removal of all tissues outs...

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  7. [A]: Action spectra for photosynthesis help to identify the pigments i...

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  8. [A] : C3 & C4 cycle can not occur in the same plant [R] : C3 cycle ...

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  9. [A]: Photosynthesis is an oxidation reduction process. [R]: Light re...

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  10. Assertion. Nitrogen deficiency induced purplish colouration in stems, ...

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  11. Assertion: C(4) photosynthetic pathway is more efficient than the C(3)...

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  12. Assertion. The atmospheric concentration of CO(2) at which photosynthe...

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  13. Assertion: Sigmoid growth curve consists of four parts. Reason : La...

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  14. [A] : 2,4-D is a herbicide [R] : It is not used during sowing of cro...

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  15. [A] : Nastic movements occur in the directions of stimuls [R] : "Tou...

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  17. [A] : Gibberellic acid , when added to isolated aleurone , induce amyl...

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  18. [A] : When apical bud is removed, the next axial bud begins to grow ou...

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  19. [A]: Xanthium will not flower if the long dark period is interrupted b...

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