- 1(current)
Q. No.When electromagnetic radiation of wavelength 300 nm falls on the surface of a metal, electrons are emitted with the kinetic energy of 1.68 × 105 J mol–1. The minimum energy needed to remove one mole of electron from the metal is:
(GivenL: h = 6.626 × 10–34 Js, c = 3 × 108 ms–1, NA = 6.022 × 1023 mol–1)
1. 2.31 × 106 J mol–1
2. 3.84 × 104 J mol–1
3. 3.84 × 10–19 J mol–1
4. 2.31 × 105 J mol–1
(GivenL: h = 6.626 × 10–34 Js, c = 3 × 108 ms–1, NA = 6.022 × 1023 mol–1)
1. 2.31 × 106 J mol–1
2. 3.84 × 104 J mol–1
3. 3.84 × 10–19 J mol–1
4. 2.31 × 105 J mol–1
Subtopic: Photo Electric Effect |
Level 3: 35%-60%
NEET - 2022
Hints
A photon of wavelength 4 × 10–7 m strikes a metal surface, the work function of the metal being 2.13 eV. The kinetic energy of emission would be:
| 1. | 0.97 eV | 2. | 97 eV |
| 3. | 4.97 × eV | 4. | 5.84 × 105 eV |
Subtopic: Photo Electric Effect |
71%
Level 2: 60%+
Hints
Links
Unlock IMPORTANT QUESTION
This question was bookmarked by 5 NEET 2025 toppers during their NEETprep journey. Get Target Batch to see this question.
✨ Perfect for quick revision & accuracy boost
Buy Target Batch
Access all premium questions instantly
When a photon with a wavelength of 150 pm strikes an atom, one of its inner bound electrons is ejected at a velocity of 1.5 × 107 m s–1 . The energy with which it is bound to the nucleus would be:
1. 32.22 × 10–16 J
2. 12.22 × 10–16 J
3. 22.27 × 10–16 J
4. 31.22 × 10–16 J
Subtopic: Photo Electric Effect |
73%
Level 2: 60%+
Hints
Links
What is the number of photons emitted per second by a 100-watt bulb, when it emits monochromatic light of wavelength 400 nm?
1. \(40.12 \times 10^{20} \ s^{-1}\)
2. \(2.012 \times 10^{21} \ s^{-1}\)
3. \(2.012 \times 10^{20} \ s^{-1}\)
4. \(20.12 \times 10^{21} \ s^{-1}\)
Subtopic: Photo Electric Effect |
78%
Level 2: 60%+
Hints
The threshold frequency \((\nu_0)\) for metal is \(6.0 × 10^{14}~\text {sec}^{-1}\). When radiation of frequency, \(\nu = 1.0 × 10^{15}~\text {sec}^{-1} \) hits the metal, the kinetic energy of the electron emitted is:
[Given: h = 6.62 × 10-34 Js]
1. 3.65 × 10–19 J
2. 2.65 × 10–19 J
3. 1.95 × 10–19 J
4. 2.95 × 10–20 J
[Given: h = 6.62 × 10-34 Js]
1. 3.65 × 10–19 J
2. 2.65 × 10–19 J
3. 1.95 × 10–19 J
4. 2.95 × 10–20 J
Subtopic: Photo Electric Effect |
82%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
- 1(current)
Q. No.
© 2025 GoodEd Technologies Pvt. Ltd.