A light of wavelength 445nm falls on a piece of metal, the maximum energy of the electron doubles when light of wavelength 225nm is used. Find the work function.

Janelle made a hypothesis bout the uneven temperatures inside her house during winter. she believes that 50% of the ducts are blocked and she plans to investigate. if she wants to prove her hypothesis using scientific processes what should she do next?

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects