Whales use sound underwater, how do they communicate such large distances?
This is largely due to water being a much better medium for sound than air. Sometimes whales are also able to exploit the differences in the speed of sound between water layers of different salinity or temperature to reflect and confine their sound to a narrow layer, having it travel a longer distance. • Can you see through walls? If you can detect electromagnetic waves that have a wavelength small enough to allow you to resolve objects on the other side, and the wall happens to be transparent to those frequencies (while being opaque to visual frequencies), you could do this. • Could sound be used as a weapon? Yes. Waves transmit energy, after all. High-intensity sound waves can carry energy to disrupt targeted objects. Sound would shake something to pieces. But the large wavelengths of audible sound make it impractical for most such uses. • Some singers can break a glass how? Resonance. If the frequency of their voice matches the natural frequency of a glass, the glass will resonate,
