Arrange the following electromagnetic radiations in the order of increasing energy.
(A) Green light
(B) Yellow light
(C) X-ray
(D) Radio wave
Choose the correct answer from the following options
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (D), (B), (A), (C)
Photon energy is inversely proportional to wavelength (E = hc/λ), so increasing energy means decreasing wavelength.
\( \lambda_{\mathrm{radio}} \gt \lambda_{\mathrm{yellow}} \gt \lambda_{\mathrm{green}} \gt \lambda_{\mathrm{X}} \)
(D) Radio wave: metres or more, the lowest energy.
(B) Yellow light: about 580 nm.
(A) Green light: about 530 nm, a little shorter than yellow.
(C) X-ray: about 1 nm or less, the highest energy.
Increasing energy: (D), (B), (A), (C).