Home › NEET UG › Chemistry › Atomic combinations › A photon of wavelength $300\,nm$ has approximate…
A photon of wavelength $300\,nm$ has approximately what energy in eV? (Use $hc = 1240\,eV\,nm$.)
A$2.07\,eV$
B$8.26\,eV$
C$4.13\,eV$
D$0.413\,eV$
Answer & Solution
Correct answer: C. $4.13\,eV$
$E = hc/\lambda = 1240/300 \approx 4.13\,eV$. The shortcut $hc = 1240\,eV\,nm$ is worth memorising — divides wavelength in nm directly to give energy in eV.
Related questions
The strength of a bond depends chiefly on the extent of:Sidewise overlapping produces charged clouds shaped like a:In a pi bond, the axes of the overlapping orbitals remain:Head-on overlap along the internuclear axis is also called:A sigma bond is formed by overlap that is:In a molecule such as HF, the covalent bond is:A bond where the electron pair sits exactly between identical nuclei is:The nitrogen bond enthalpy of 946 kJ per mol is one of the: