railway RRB Technician Grade 3 Mock Test 2024 General Science Physics Units and Dimensional Formula

तरंगदैर्ध्य को आमतौर पर ग्रीक अक्षर ______ द्वारा निरूपित किया जाता है। 

1
कप्पा (ϰ) 
2
अल्फा (α)
3
लैम्ब्डा (λ)
4
एटा (η)
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