Help and explain how to convert it pls

Answer : The correct answer is option (3)

Explanation: Given,

Wavelength =  350 nm =        

Now we have to determine the energy of photon.

Formula used:

where,

E = energy  of photon

h = Planck's constant =  

c = speed of light =  

= wavelength of photon

Now putting all the given values in this formula, we get:

Therefore, the energy of photon is,

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

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