Arrange the following in the ascending order of wavelength:
A. Gamma rays (λ₁)
B. x - rays (λ₂)
C. Infrared waves (λ₃)
D. Microwaves (λ₄)
Choose the most appropriate answer from the options given below

Solution

Physics sir · 2 steps

Walk the spectrum from the high-energy end: gamma, then X-rays, then infrared, then microwaves.

1. Recall the order. In increasing wavelength the spectrum runs: gamma rays, X-rays, ultraviolet, visible, infrared, microwaves, radio waves. Energy and frequency fall as you move along this list.

   Radiation	Typical wavelength
   Gamma rays (λ₁)	below about 10⁻¹² m
   X-rays (λ₂)	about 10⁻¹² to 10⁻⁸ m
   Infrared (λ₃)	about 7 × 10⁻⁷ to 10⁻³ m
   Microwaves (λ₄)	about 10⁻³ to 0.3 m

2. So. Ascending order of wavelength is λ₁ < λ₂ < λ₃ < λ₄, which is option (a).

The idea to keep. Learn the spectrum as one sequence: gamma, X, UV, visible, IR, micro, radio. Wavelength rises along it while frequency and photon energy fall.

Answer from the NTA final answer key. Solution by PrepWiser.