[填空题]
A satellite dish is about 0.5 m in diameter. Accordinxq tpg/hyj4(u4:zg. a g to the user’s manuabq upyg/z; x *8k7t*fil, the dish has to be pointed in the direction of the satellite, but an errortq7 8*xb/;fizup gk*y of about 2 $^{\circ} $ is allowed without loss of reception. Estimate the wavelength of the electromagnetic waves received by the dish. m
