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Friday, 9 October

JEE Main 2017 · PhysicsMultiple choiceSingle correctMediumData or graph

JEE Main 2 April 2017 (offline), Physics Q21

Question 21 of 90 in this shift, Physics question 21 of 30.

An electron beam is accelerated by a potential difference V to hit a metallic target to produce X-rays. It produces continuous as well as characteristic X-rays. If λmin\lambda_{min} is the smallest possible wavelength of X-ray in the spectrum, the variation of log⁡λmin\log\lambda_{min} with log⁡V\log V is correctly represented in :

The figure, in words

Four graphs of log lambda_min (vertical) vs log V (horizontal).
  1. (1)[figure: log λ_min vs log V, straight line with negative slope from the vertical axis down to the horizontal axis]Official answer
  2. (2)[figure: log λ_min vs log V, straight line through the origin with positive slope]
  3. (3)[figure: log λ_min vs log V, straight line with positive slope and positive intercept on the vertical axis]
  4. (4)[figure: log λ_min vs log V, horizontal straight line (constant)]

Official answer

Option 1

CBSE answer key (25/04/2017, used for result).

Chapter
Atoms
Topic
X-Ray Production
Idea tested
Cutoff Wavelength Shortcut Formula

Same topic in other shifts

All X-Ray Production questions
  1. 8 Apr 2023, Shift 2 · Q47The waves emitted when a metal target is bombarded with high energy electrons areEasySingle correct
  2. 8 Apr 2023, Shift 2 · Q64Henry Moseley studied characteristic X-ray spectra of elements. The graph which represents his observation correctly is Given ν\nu =…EasyDiagram basedHas a figure

Question text from the official JEE Main paper published by NTA (CBSE ran the 2017 exam); answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.