JEE Main · 2022 · Shift-IIeasyATOM-077

The minimum energy that must be possessed by photons to produce the photoelectric effect with platinum metal is:…

Structure of Atom · Class 11 · JEE Main Previous Year Question

Question

The minimum energy that must be possessed by photons to produce the photoelectric effect with platinum metal is:

[threshold frequency =1.3×1015= 1.3\times10^{15} s−1^{-1}, h=6.6×10−34h=6.6\times10^{-34} Js]

Options
  1. a

    8.58×10−198.58\times10^{-19} J

    ✓
  2. b

    9.76×10−209.76\times10^{-20} J

  3. c

    3.21×10−143.21\times10^{-14} J

  4. d

    6.24×10−166.24\times10^{-16} J

Correct Answera

8.58×10−198.58\times10^{-19} J

Detailed Solution

🧠 The Entry Fee (Threshold) The minimum energy (Work Function) is the exact product of hh and the threshold frequency (ν0\nu_0).

🗺️ The Clean Product

  1. Calculation: W0=hν0=(6.6×10−34)×(1.3×1015)W_0 = h\nu_0 = (6.6 \times 10^{-34}) \times (1.3 \times 10^{15}).
  2. Result: 8.58×10−19 J8.58 \times 10^{-19} \text{ J}.

⚡ The 10−1910^{-19} Range Work functions in Joules are almost always in the 10−1910^{-19} range. If you get −14-14 or −20-20, you've missed a power of ten.

⚠️ Common Traps Don't use c/λc/\lambda unless wavelength is given. Multiplication is safer here.

Answer: (A)\boxed{\text{Answer: (A)}}

Practice this question with progress tracking

Want timed practice with adaptive difficulty? Solve this question (and hundreds more from Structure of Atom) inside The Crucible, our adaptive practice platform.

Practice in The Crucible →Browse Structure of Atom chapter →

More JEE Main Structure of Atom PYQs

2020medium

The figure that is not a direct manifestation of the quantum nature of atom is:

2019medium

What is the work function of the metal if the light of wavelength 4000 Å generates photoelectrons of velocity 6105 ms-1 from it? (Mass of electron =910-31 kg, c=3108 ms-1, h=6.62610-34 Js, charge of…

2019hard

If p is the momentum of the fastest electron ejected from a metal surface after irradiation of light having wavelength , then for 1.5p momentum of the photoelectron, the wavelength of the light…

2019medium

Which of the graphs shown below does not represent the relationship between incident light and the electron ejected from metal surface?

2025medium

For electron in '2s' and '2p' orbitals, the orbital angular momentum values, respectively are:

View all 85 Structure of Atom PYQs →