[填空题]
1.With reference to energy conversio;c* l.tywy8dl n, distinguish between )grqzabs+7c ) photovoltaic cells and solar heating panelz qcb7)s)arg+s.
2.On a sunny day, a house is powered by a solar panel. In order to run home appliances, the incident power of sunlight on the solar panel must be 10 kW.
(1)The average surface temperature of the Sun is 5850K. Show that the peak wavelength of the emission of the sun is around 500nm. $λ_max$ = nm
(2)It can be assumed that 7.5% of the energy from incident sunlight consists of peak wavelength photons that are converted to electrical energy by the panel. Calculate the number of 500nm photons that must strike the solar panel per second in order to meet the power requirement of the appliances. n = $\times10^{21}$
