Physics Alternating Current PMDC Conceptual Practice
PMDC Verified Question 69 of 127
An electromagnetic wave has a wavelength of \(1.5 \times 10^{-2}\text{ m}\). To which region of the electromagnetic spectrum does this wave belong?
A
X-rays
B
Microwaves
C
Ultraviolet rays
D
Visible light
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Microwaves
Concept:

The microwave region spans wavelengths from \(1\text{ mm}\) (\(10^{-3}\text{ m}\)) to \(1\text{ m}\) (\(10^0\text{ m}\)).

Formula / Reaction:

$$\lambda = 1.5 \times 10^{-2}\text{ m} = 1.5\text{ cm} \in [1\text{ mm}, 1\text{ m}]$$

Solution:

  • \(1.5\text{ cm}\) lies directly in the microwave band.


Why other options are incorrect:

  • Opt_A: X-ray wavelengths are \(10^{-11}\text{ m to }10^{-8}\text{ m}\).


  • Opt_C: Ultraviolet wavelengths are \(10^{-8}\text{ m to }4 \times 10^{-7}\text{ m}\).


  • Opt_D: Visible wavelengths are \(4 \times 10^{-7}\text{ m to }7 \times 10^{-7}\text{ m}\).

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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