Question

what is a real - life example where wavelength matters? *
listening to music
watching tv
using a microwave
riding a bike

Explanation:

Microwaves are a form of electromagnetic radiation with specific wavelengths that are used to heat food. The wavelength of microwaves matters as it is tuned to interact with water molecules in food. Listening to music involves sound - waves but wavelength is not the most prominent factor in the context compared to frequency. Watching TV involves electromagnetic signals but the focus is more on signal encoding and decoding rather than wavelength in a direct, everyday - use sense. Riding a bike has no direct relation to wavelength.

Answer:

C. Using a microwave