Waves are affected by the characteristics of the medium through which they travel. Density affects wave speedâwaves generally travel slower in dense materials and faster in less-dense materials. For example, a sound wave travels nearly three times faster in helium than in air; helium is less dense than air.
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More Photos. Toyota intends to introduce a smaller, less-expensive model in the Mirai hydrogen fuel cell family in time for the 2020 Olympics in Tokyo, the Asahi Shimbun reports. The new model will reportedly hit the road in 2019 at a cost of 5.5 million to 6.0 million yen ($50,600 to $55,200 US at current exchange rates).