Q32.If λ0 and λ be threshold wavelength and wavelength of incident light, the velocity of photoelectron ejected from the metal surface is: m (λo (1) √2hm (λ0 −λ) (2) √2hc −λ) m ( λo −1λ ) (3) √2hc λ0−λ (4) 1 m ( λλ0 ) √2h
What This Question Tests
This question requires applying the photoelectric effect equation to relate incident wavelength, threshold wavelength, and the velocity of the ejected photoelectron, involving algebraic rearrangement.
Concepts Tested
Formulas Used
hc/λ = hc/λ₀ + 1/2 mv²
hc/λ = hf
📚 NCERT Sections This Tests
11.8 — Light Of Frequency 7.21 × 1014 Hz Is Incident On A Metal Surface.
Physics Class 12 · Chapter 11
11.8 Light of frequency 7.21 × 1014 Hz is incident on a metal surface. Electrons with a maximum speed of 6.0 × 105 m/s are ejected from the surface. What is the threshold frequency for photoemission of electrons?
11.3 — The Photoelectric Cut-Off Voltage In A Certain Experiment Is 1.5 V.
Physics Class 12 · Chapter 11
11.3 The photoelectric cut-off voltage in a certain experiment is 1.5 V. What is the maximum kinetic energy of photoelectrons emitted?
11.6 — The Threshold Frequency For A Certain Metal Is 3.3 × 1014 Hz. If Light
Physics Class 12 · Chapter 11
11.6 The threshold frequency for a certain metal is 3.3 × 1014 Hz. If light of frequency 8.2 × 1014 Hz is incident on the metal, predict the cut- off voltage for the photoelectric emission.
📋 Question Details
- Chapter
- Atomic Structure
- Topic
- Photoelectric Effect
- Year
- 2014
- Shift
- 11 Apr Online
- Q Number
- Q32
- Type
- MCQ
- NCERT Ref
- Class 11 Chemistry Ch 2: Structure of Atom
More from this Chapter
Q82.Which one of the following groupings represents a collection of isoelectronic species? (At. nos,: 55, Br:35) (1) N3−, F−, Na+ (2) Be, Al3+, Cl− (3) Ca2+, Cs+, Br (4) Na+, Ca2+, Mg2+
Q83.In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inter-orbit jumps of the electron for Bohr orbits in an atom of hydrogen (1) 5 →2 (2) 4 →1 (3) 2 →5 (4) 3 →2
Q84.The de Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 metres per second is approximately (1) 10−31 metres (2) 10−16 metres (3) 10−25 metres (4) 10−33 metres Planck's constant, h = 6.63 × 10−34Js.
Q79.Which of the following sets of quantum numbers is correct for an electron in 4f orbital? (1) n = 4, l = 3, m = +4, s = + 12 (2) n = 3, I = 2, m = −2, S = + 12 (3) n = 4, I = 3, m = +1, s = + 12 (4) n = 4, I = 4, m −4, s = −12