Discuss Forum

1.

লােহিত রশ্মির (red ray) তরঙ্গ দৈর্ঘ্য (wavelength) কত?

 

 

  • A. 500 – 570 nm
  • B. 500 – 570 nm
  • C. 500 – 570 nm
  • D. 500 – 570 nm

Answer: Option D

Explanation:

Post your comments here:

Name:
Mobile:
Email:(Optional)

» Your comments will be displayed only after manual approval.