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The diffraction effects of sound waves are noticeable in everyday life, whereas the diffraction effects of light waves are not - Leaving Cert Physics - Question d - 2017
Question d
The diffraction effects of sound waves are noticeable in everyday life, whereas the diffraction effects of light waves are not. Explain why.
Worked Solution & Example Answer:The diffraction effects of sound waves are noticeable in everyday life, whereas the diffraction effects of light waves are not - Leaving Cert Physics - Question d - 2017
Step 1
Explain why sound waves show noticeable diffraction effects
Answer
Sound waves have relatively long wavelengths, typically ranging from a few centimeters to several meters. This means that when sound waves encounter obstacles (like buildings, walls, or furniture), their longer wavelengths allow them to bend around these obstacles easily. This bending results in noticeable diffraction effects, enabling us to hear sounds even when they originate from around corners or behind barriers.
Step 2
Explain why light waves show minimal diffraction effects
Answer
In contrast, light waves have much shorter wavelengths, typically in the range of nanometers (about 400 to 700 nanometers for visible light). When light waves encounter obstacles that are not comparable in size to their wavelength, they tend to travel in straight lines rather than bending around them. Thus, the diffraction effects of light are not noticeable in everyday situations, making it harder for us to observe light bending around barriers.