Consider the figure given below. Suppose the voltage applied to A is increased. The diffracted beam will have the maximum at a value of θ that 

(a) Will be larger than the earlier value
(b) Will be the same as the earlier value
(c) Will be less than the earlier value
(d) Will depend on the target

0 2 Views | Posted 3 months ago
Asked by Shiksha User

  • 1 Answer

  • A

    Answered by

    alok kumar singh | Contributor-Level 10

    3 months ago

    This is a Multiple Choice Questions as classified in NCERT Exemplar

    Answer- (c)

    Explanation- In Davisson-Germer experiment, the de-Broglie wavelength associated with electron is

    λ = 12.27/ V

    Å . (i)where V is the applied voltage.

    If there is a maxima of the diffracted electrons at an angle θ, then

    2dsinθ = λ … (ii)

    From Eq. (i), we note that if V is inversely proportional to the wavelength λ.

    i.e., V will increase with the decrease in the λ.

    From Eq. (ii), we note that wavelength λ is directly proportional to sinθ and hence θ.

    So, with the decrease in λ, θ will

    ...more

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This is a Short Answer Type Questions as classified in NCERT Exemplar

Sol:

f(x)=2x23x2x2=2x24x+x2x2=2x(x2)+1(x2)x2=(2x+1)(x2)x2=2x+1limx2f(x)=2x+1=limh02(2h)+1=4+1=5limx2+f(x)=2x+1=limh02(2+h)+1=4+1=5limx2f(x)=5Aslimx2f(x)=limx2+f(x)=limx2f(x)=5Hence,f(x)iscontinuousatx=2.

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