A collimated light beam of total power 60 W enters a hollow cone whose axis is parallel to the beam. The semi-vertical angle is 30°. Of the incident power, 40% is absorbed by the conical surface, 50% is specularly reflected and 10% is transmitted without changing direction. Take c = 3×10⁸ m·s⁻¹. If the net axial force on the cone is N×10⁻⁸ N, find N.
Physics · Photoelectric effect and dual nature of matter · question based on photoelectric effect
A collimated light beam of total power 60 W enters a hollow cone whose axis is parallel to the beam. The semi-vertical angle is 30°. Of the incident power, 40% is absorbed by the conical surface, 50% is specularly reflected and 10% is transmitted without changing direction. Take c = 3×10⁸ m·s⁻¹. If the net axial force on the cone is N×10⁻⁸ N, find N.