How to calculate the wavelength in this particular question

  • 1
I am so so sorry, Kripa.
I don't know the answer.
  • 1
It's ok
  • 0
No worry
  • 0
But I wanted the answer now because tomorrow I'm having my 9th ICSE board examination.
  • 0
Someone, please answer fast
  • 0
What are you looking for?