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Electromagnetic Waves question

2022 · 26 Jun · Shift 2 · Q61
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Electromagnetic Waves question

2022 · 26 Jun · Shift 2 · Q61

JEE MainPhysicsElectromagnetic WavesMCQ+4 / −1
Which is the correct ascending order of wavelengths?
  1. A
    λ\lambdaλ visible X-ray gamma-ray microwave
  2. B
    λ\lambdaλ gamma-ray X-ray visible microwave
  3. C
    λ\lambdaλ X-ray gamma-ray visible microwave
  4. D
    λ\lambdaλ microwave visible gamma-ray X-ray
View written solutionFree

Correct answer: B

  1. Recall the electromagnetic spectrum order

    In increasing order of wavelength, electromagnetic waves are arranged as:

    gamma rays<X-rays<ultraviolet<visible<infrared<microwaves<radio waves\text{gamma rays} < \text{X-rays} < \text{ultraviolet} < \text{visible} < \text{infrared} < \text{microwaves} < \text{radio waves}gamma rays<X-rays<ultraviolet<visible<infrared<microwaves<radio waves

  2. Pick only the waves mentioned in the options

    The given types are:

    • gamma-ray
    • X-ray
    • visible
    • microwave

    Therefore, their ascending order of wavelength is:

    γ-ray<X-ray<visible<microwave\gamma\text{-ray} < X\text{-ray} < \text{visible} < \text{microwave}γ-ray<X-ray<visible<microwave

  3. Compare with the options

    • A: visible, X-ray, gamma-ray, microwave → not ascending
    • B: gamma-ray, X-ray, visible, microwave → correct
    • C: X-ray, gamma-ray, visible, microwave → first two are reversed
    • D: microwave, visible, gamma-ray, X-ray → descending at first
  4. Derived answer

    The correct option is:

    B\boxed{\text{B}}B​

  5. Comparison with stored correct answer

    Stored correct answer = B

    My derived answer = B

    Hence, they agree.

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