[填空题]
1.With reference to energy conversion, d0 4yk x4br y5bqteil5b81 .jfeistinguish betwe4, ipkpi , dnwx5t7sn1 co0f8ten photovoltaic cells and solar hi,xkn 5ntp,o t17ficw0s8p d4 eating panels.
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 = $\times10^{21}$
