- AMarie Curie
- BPierree Curie
- ✓James Chadwick
- DRutherford
James Chadwick discovered the neutron.
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$(a)$ Maximum $KE$ associated with photoelectrons from the surface of any metal is $0.3\ eV$
$(b)$ No photoelectrons are emitted from the surface of $Ni$
$(c)$ If the frequency of the source of radiation is doubled then $KE$ of photoelectrons is also doubled
$(d)$ Photoelectrons will be emitted from the surfaces of all the three metals if the wavelength of the incident radiation is less than $200\ nm$
Correct statements are
Mass of neutron $=1.00866 \,{u}$
Mass of proton $=1.00726 \,{u}$
Mass of aluminium nucleus $=27.18846\, {u}$
(Assume $1\,u$ corresponds to $x\,J$ of energy)
(Round off to the nearest integer)
