[填空题]
A satellite dish is alqj 1 gwzrf1-:)1 thzn wh9ze4bout 0.5 m in yq: btawyx,/y0c6m-zm8 n a+tr.jwvt ;16 kapdiameter. According to the user’s manual, the dish has to be pointed in the directionm/:601y+yzn -;kw c yjtabtmrva a ,t.6x8 qwp of the satellite, but an error of about 2 $^{\circ} $ is allowed without loss of reception. Estimate the wavelength of the electromagnetic waves received by the dish. m