If the intensity of the incident radio wave of 1 watt m−2 is reflected by the surface the pressure exerted on the surface is ________×10−9N/m2

Pressure exerted by reflected wave on the surface is  P=2ICIntensity of incident, radio wave is  I=1 watt m−2Velocity of light ,  C=3×108ms−1Pressure ,   P=2×13×108                            P=6.67×10−9N/m2