Concepts Of Physics MCQ Edition [Volume 2]
- Exam
- Concepts Of Physics MCQ Edition [Volume 2]
- Subject
- Physics
- Chapter
- Photoelectric Effect and Wave–Particle Duality
Concepts Of Physics MCQ Edition [Volume 2] · Physics · Photoelectric Effect and Wave–Particle Duality
A photographic film is coated with a layer of silver bromide. When...
A photographic film is coated with a layer of silver bromide. When light strikes this film, the silver bromide molecules dissociate, and the film records the light. A minimum of is required to dissociate a silver bromide molecule. Determine the maximum wavelength of light that can be recorded by the film.
Options
- A
- B
- C
- D
Correct answer
B.
Step-by-step solution
The minimum energy required to dissociate a silver bromide molecule is given as .
The energy of a photon is related to its wavelength by the equation .
For maximum wavelength, the energy of the photon must be equal to the minimum dissociation energy.
\lambda_\max = \dfrac{hc}{E_\min}
Substituting and E_\min = 0.6 \text{ eV}:
\lambda_\max = \dfrac{1242}{0.6} \text{ nm}
\lambda_\max = 2070 \text{ nm}
The energy of a photon is related to its wavelength by the equation .
For maximum wavelength, the energy of the photon must be equal to the minimum dissociation energy.
\lambda_\max = \dfrac{hc}{E_\min}
Substituting and E_\min = 0.6 \text{ eV}:
\lambda_\max = \dfrac{1242}{0.6} \text{ nm}
\lambda_\max = 2070 \text{ nm}