The energy required to break one mole of bonds in is . The longest wavelength of light capable of breaking a single bond is
( and )
( and )
- (A)594 nm
- (B)640 nm
- (C)700 nm
- (D)494 nm✓ Correct
Answer: (D)
Solution
The quoted bond energy is per mole, so the energy to break a single bond is J. A photon just able to supply this has equal to it, so the longest usable wavelength is m, about nm. Any longer wavelength carries too little energy per photon to break the bond.
JEE Main · 2010 · 11 Apr 2010 · Offline · Single correct option