What is the wavelength of a wave with a speed of 12 m/s and a period (T)
of 0.25 s? (Recall from the notes: f = 1/T)

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

Aprisoner is forced to go into one of three rooms, but he can choose which room. the first room is ablaze with fire. the second one is rigged with explosives that will go off as soon as he enters. the third contains a pair of lions who haven't eaten in years. which room should he choose to survive?