Discuss Forum

1.

দৃশ্যমান আলাে (visble light)-এর তরঙ্গদৈর্ঘ্য (wave length) কত?

 

  • A. 200-700 nm
  • B. 200-700 nm
  • C. 200-700 nm
  • D. 200-700 nm

Answer: Option D

Explanation:

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