alleryYour voice bends round a doorway but a hillock returns an echo. The hillock is:
AToo far away to matter
BMuch larger than the wavelength
CSmaller than the wavelength
DMade of soft material
Answer & Solution
Correct answer: B. Much larger than the wavelength
1. Speech has a wavelength of about a metre.
2. A doorway is about that size, so sound bends round it.
3. A hillock is hundreds of metres, so most sound reflects.
_Source: syllabus Physics Part II, Chapter 10, Wave Optics._
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