What is the least frequency?

In the electromagnetic spectrum the lowest frequency range is 300 GHz to 3 kHz and these are known as radio waves.You can read about LIGO India – Gravitational Wave Detector in India in the given link.

Further readings:

  1. Topic-Wise GS 3 Questions for UPSC Mains
  2. Science & Technology Notes For UPSC – General Science Notes 

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