If wavelength of photon is 2×`10 ^(−11)` m, h=6.6×`10 ^(−34)`Jsec, then momentum of photon is

Options

A. `4×10^(−23)kgms^(−1)`
B. `3.3×10^(−23)kgms^(−1)`
C. `6×10^(−23)kgms^(−1)`
D. `2×10^(−23)kgms^(−1)`

Answer

1

Explanation

`{:(HA,+,NaOH,rarr,NaA,+,H_(2)O),("Weak acid",,"Strong base",,"Salt of weak acid & strong base.",,):}`
Upon `50%` neutralization the amount of weak acid left and that of salt formed will be same and the system will act as an acidic buffer.
`{:(,HA,+,NaOH,rarr,NaA,+,H_(2)O),("Upon 50% Neutralization",a//2,,,,a//2,,):}`
`pH=PK_(a)+log.([Sal t])/([Aci d])`
`=4+log.(a//2)/(a//2)=4 " "Ans.(1)`