- 1(current)
Q. No.A bulb is rated at 150 watt, converting 8% energy into light. If energy of one photon is \(4.42 \times 10^{-19} \mathrm{~J}\), how many photons are emitted by the bulb per second?
1. \(1.35 \times 10^{19}\)
2. \(4.06 \times 10^{19}\)
3. \(2.71 \times 10^{19}\)
4. \(27.2 \times 10^{19}\)
1. \(1.35 \times 10^{19}\)
2. \(4.06 \times 10^{19}\)
3. \(2.71 \times 10^{19}\)
4. \(27.2 \times 10^{19}\)
Subtopic: Photo Electric Effect |
64%
Level 2: 60%+
NEET - 2026
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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
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