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(A) : Winter nights are warmer when clou...

(A) : Winter nights are warmer when clouds cover the sky
( R) : Clouds allow radiations of shorter wavelength through them but reflect radiations of longer wavelength.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

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The correct Answer is:
A
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The only electron in the hydrogen atom resides under ordinary conditions on the first orbit. When energy is supplied, the electron moves to higher energy orbit depending on the amount of energy absorbed. When this electron returns to any of the lower orbits, it emits energy. Lyman series is formed when the electron returns to the lowest orbit while Balmer series is formed when the electron returns to second orbit. Similarly, Paschen, Brackett and Pfund series are formed when electron returns to the third, fourth orbits from higher energy orbits respectively (as shown in figure) Maximum number of lines produced when an electron jumps from nth level to ground level is equal to (n(n-1))/(2) . For example, in the case of n = 4, number of lines produced is 6. (4 rarr 3, 4 rarr 2, 4 rarr 1, 3 rarr 2, 3 rarr 1, 2 rarr 1) . When an electron returns from n_(2) to n_(1) state, the number of lines in the spectrum will be equal to ((n_(2) - n_(1))(n_(2)-n_(1) +1))/(2) If the electron comes back from energy level having energy E_(2) to energy level having energy E_(2) then the difference may be expressed in terms of energy of photon as E_(2) - E_(1) = Delta E, lambda = (h c)/(Delta E) . Since h and c are constant, Delta E corresponds to definite energy, thus each transition from one energy level to another will prouce a higher of definite wavelength. THis is actually observed as a line in the spectrum of hydrogen atom. Wave number of the line is given by the formula bar(v) = RZ^(2)((1)/(n_(1)^(2)) - (1)/(n_(2)^(2))) Where R is a Rydberg constant (R = 1.1 xx 10^(7)) (i) First line of a series : it is called .line of logest wavelength. or .line of shortest energy.. (ii) Series limit of last of a series : It is the line of shortest wavelength or line of highest energy. The wave number of electromagnetic radiation emitted during the transition of electron in between two levels of Li^(2+) ion whose principal quantum numbers sum if 4 and difference is 2 is

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AAKASH SERIES-THERMAL PROPERTIES OF MATTER-EXERCISE-IB
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  4. (A) : When temperature difference across the two sides of a wall is in...

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  5. (A) : Two layers of cloth of same thickness provide warmer covering th...

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  6. (A) : Heat transfer always involves temperature difference between two...

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  7. (A) : Greater is the coefficient of thermal conductivity of a material...

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  8. (A) : During solar eclipse, the solar spectrum is an emission spectrum...

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  9. (A) : Convection involves flow of matter with in a fluid due to unequa...

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  10. (A) : Winter nights are warmer when clouds cover the sky ( R) : Clou...

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  11. (A) : All black coloured objects are considered as black bodies. ( R...

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  12. (A) : 'Green houses' which are used to keep the plants in warm atmosph...

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  13. (A) : The radiation from the sun's surface varies as the fourth power ...

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  14. (A) : Animals curl into a ball, when they feel very cold. ( R) : Ani...

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  15. (A) : A body that is a good radiator is also a good absorber of radiat...

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  16. (A) : For higher temperature, the peak emission wavelength of a black ...

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  17. (A) : Temperatures near the sea coast are moderate. ( R) : Water has...

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  18. (A) : It is hotter over the top of a fire than at the same distance on...

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  19. (A) : Bodies radiate heat at all temperatures. ( R) : Rate of radiat...

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  20. (A) : A hollow metallic closed container maintained at a uniform tempe...

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