Photoelectric Effect is an important topic in the Physics section in MHT CET exam. Practising this topic will increase your score overall and make your conceptual grip on MHT CET exam stronger.
This article gives you a full set of MHT CET PYQs for Photoelectric Effect with explanations for effective preparation. Practice of MHT CET Physics PYQs including Photoelectric Effect questions regularly will improve accuracy, speed, and confidence in the MHT CET 2026 exam.
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MHT CET PYQs for Photoelectric Effect with Solutions
1.
In a photoelectric effect experiment, light of wavelength \( \lambda \), \( \lambda/2 \), and \( \lambda/6 \) are incident on a metal surface. The stopping potential for these wavelengths are given as \( V_1 \), \( V_2 \), and \( V_3 \), respectively. If the work function of the metal is \( \phi \), calculate the work function using the given wavelengths. The photoelectric equation is given by: \[ E_k = h \nu - \phi \] where:
\( E_k \) is the kinetic energy of the emitted electrons (which is related to the stopping potential),
\( h \) is Planck's constant,
\( \nu \) is the frequency of the incident light,
\( \phi \) is the work function of the metal.The frequency \( \nu \) is related to the wavelength \( \lambda \) by the equation: \[ \nu = \frac{c}{\lambda} \] where \( c \) is the speed of light.
- \( \phi = \frac{h c}{\lambda} \)
- \( \phi = \frac{h c}{2 \lambda} \)
- \( \phi = \frac{h c}{6 \lambda} \)
- \( \phi = \frac{h c}{\lambda} + \frac{h c}{2 \lambda} + \frac{h c}{6 \lambda} \)
2.
The stopping potential of the photoelectrons, from a photo cell is- directly proportional to intensity of incident light
- directly proportional to frequency of incident light
- inversely proportional to frequency of incident light
- Inversely proportional to intensity of incident light
3.
The difference between threshold wavelengths for two metal surfaces \( A \) and \( B \) having work functions \( \phi_A = 9 \, \text{eV} \) and \( \phi_B = 4.5 \, \text{eV} \) is: \[ \text{(Given: } h c = 1242 \, \text{eV nm)} \]- \( 264 \, \text{nm} \)
- \( 138 \, \text{nm} \)
- \( 276 \, \text{nm} \)
- \( 540 \, \text{nm} \)
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