The work function of sodium is 2.46eV and its threshold wavelength is 5040 A∘. Then the value of universal plank’s constant is (given c=3 times 10^8 m/s ) A ) 5.6 × 10 − 34 J s B ) 8.6 × 10 − 34 J s C ) 7.6 × 10 − 34 J s D ) 6.6 × 10 − 34 J s

Question

The work function of sodium is 2.46eV and its threshold wavelength is 5040 A∘. Then the value of universal plank’s constant is (given c=3 times 10^8 m/s  )   A  )  5.6  ×      10          −      34        J  s    B  )  8.6  ×      10          −      34        J  s    C  )  7.6  ×      10          −      34        J  s    D  )  6.6  ×      10          −      34        J  s

chumanhonv19s · Accepted Answer

The correct option is  D   6.6  ×      10          −      34           J  s    ϕ  =            h      c        λ    ;  ϕ  =  2.46  e  V  ,  λ  =  5040  A  ,  C  =  3  ×      10    8    m      /    s    h  =            ϕ      λ        c    =            2.46      ×      16      ×              10                  −          19                    ×      5040      ×              10                  −          10                            3      ×              10        8                =  6.6  ×      10    3    ×      10          −      19        ×      10          −      10        ×      10          −      8        =  6.6  ×      10          −      34           J  s

The work function of sodium is 2.46eV and its threshold wavelength is 5040 A^(@). Then the value of universal plank’s constant is (given c=3 xx 10^8 m/s)

Answered question

Answer & Explanation

New Questions in Advanced Physics