TG EAMCET 3 May 2025 Shift 1 Paper

λ‌=‌

hc

E

‌=‌

6.62×10−34×3×108

1.9×1.6×10−19

‌=6.53×10−7m
‌≃653nm
The visible light spectrum ranges approximately 400 nm (violet) to 700 nm (red). A wavelength of 653 nm falls with in the red part of the spectrum. Therefore, the colour of the light emitted by the LED is red.