Sorry, no online dictionaries contain the exact phrase planck's energy-frequency relation.

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1. ratio
2. quantum theory
3. bearing
4. chime
5. chiming
6. touch
7. touched
8. apron
9. blind
10. blinds
11. clamp
12. cribbing
13. featheredge
14. gemeinschaft
15. glower
16. gunwale
17. heater
18. post
19. strake
20. sypher
21. threshold
22. wale
23. absolute
24. law
25. voice
26. alps
27. benching
28. blanch
29. blanched
30. blank
31. blanking
32. board
33. bolt
34. bridge
35. bridged
36. bridging
37. butt
38. butted
39. camber
40. cambered

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