Practice portal › Electromagnetic Waves › Uses of the Bands, and lambda nu = c

Two opposite charged particles oscillate about their mean equilibrium position in free space with a frequency of 10⁹ Hz. The wavelength of the corresponding electromagnetic wave produced is ______.

Asked in GSEB Board July 2015; GSEB Board March 2018 · Wavelength, frequency and photon energy

• (1) 0.3 m
• (2) 3×10¹⁷ m
• (3) 10⁹ m
• (4) 3.3 m

Step-by-step solution

Why the other options are wrong

• (2) comes from multiplying by the frequency instead of dividing: 3×10⁸×10⁹=3×10¹⁷.
• (3) comes from simply repeats the frequency as though it were a length.
• (4) comes from is the reciprocal of the answer, 1/(0.3)=3.3. That number is the count of waves per metre, not a wavelength.

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