Q62.A 10 inches long pencil AB with mid point C and a small eraser P are placed on the horizontal top of a table such that PC = √5 inches and ∠PCB = tan−1(2). The acute angle through which the pencil must be rotated about C so that the perpendicular distance between eraser and pencil becomes exactly 1 inch is : (1) tan−1( 43 ) (2) tan−1( 21 ) (3) tan−1( 43 ) (4) tan−1(1)
What This Question Tests
This question applies the photoelectric effect equation to calculate the velocity of ejected electrons, involving the calculation of photon energy, work function, and kinetic energy.
Concepts Tested
Formulas Used
E = hν
E = hc/λ
KE_max = hν - hν₀
KE_max = 1/2 mv²
📚 NCERT Sections This Tests
11.5 — In An Experiment On Photoelectric Effect, The Slope Of The Cut-Off Voltage
Physics Class 12 · Chapter 11
11.5 In an experiment on photoelectric effect, the slope of the cut-off voltage versus frequency of incident light is found to be 4.12 × 10–15 V s. Calculate the value of Planck’s constant.
12.5 — A Hydrogen Atom Initially In The Ground Level Absorbs A Photon,
Physics Class 12 · Chapter 12
12.5 A hydrogen atom initially in the ground level absorbs a photon, which excites it to the n = 4 level. Determine the wavelength and frequency of photon.
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
- 2021
- Shift
- 26 Aug Shift 2
- Q Number
- Q62
- Type
- Numerical
- NCERT Ref
- Class 11 Chemistry Ch 2: Structure of Atom
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