TS Police SI Prelims 2022 · Question 198

Question 198 of the TSLPRB SI Preliminary Written Test 2022 (7 August 2022). Try it first, then open the answer and explanation.

1. SI Prelims 2022 · Q198 · General Science · Science & Technology

   The size of quantum nano dots is around ______

   1. 300 nm
   2. 200 nm
   3. 100 nm
   4. 10 nm

   క్వాంటమ్ నానో డాట్స్ యొక్క సమానమైన పరిమాణము విలువ

   1. 300 nm
   2. 200 nm
   3. 100 nm
   4. 10 nm
   Show answer

   Answer: (4) 10 nm

   సమాధానం: (4) 10 nm

   Quantum dots are semiconductor nanocrystals usually about 2-10 nm across. At this size quantum confinement controls the colour of light they emit, and the 100-300 nm values are far too large.

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