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(A): The possibility of an electric bulb...

(A): The possibility of an electric bulb fusing is higher al the time of switching on and off.
(R): Inductive effects produce a surge at the time of switch-off and switch-on

A

Both A and R are true and R is the correct explanation

B

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

C

A is true but R is false

D

Both A and R are false

Text Solution

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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 difference in the wavelength of the 2^(nd) line of Lyman series and last line of Bracket series in a hydrogen sample is

AAKASH SERIES-ELECTROMAGNETIC INDUCTION-EXERCISE-IB
  1. (A): Total induced emf in a loop is not confined to any particular poi...

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  2. (A): Unlike electrostatic field the lines of induced field from closed...

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  3. (A): The mutual induction between the two coils infinitely apart is ze...

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  4. (A) Inductance is called the inertia of an electric circuit. (R): An...

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  5. (A): At any instant, if the current through an inductor is zero, then ...

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  6. (A): There may be an induced emf in a loop without induced current (...

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  7. (A): When the magnetic flux through a loop is maximum, induced emf is ...

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  8. (A): When conducting loop is kept stationary in a non-uniform magnetic...

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  9. (A): When an electric motor is started, a variable resistance (that de...

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  10. (A): The power output of a practical trans- former is always smaller t...

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  11. (A): Electrical power through transmission lines is transmitted at hig...

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  12. (A): The electric field induced due to changing magnetic field is non-...

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  13. (A): In equation F=q(E+v xx B) when v = 0, any force on the charge mus...

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  14. (A): The induced current flows so as to oppose the cause producing it....

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  15. (A): Only a change in magnetic flux will maintain an induced current i...

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  16. (A): If changing current is flowing through a machine of iron eddy cur...

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  17. (A): The possibility of an electric bulb fusing is higher al the time ...

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  18. (A): An emf is induced in a closed loop where magnetic flux is varied....

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