Cho một chùm ánh sáng trắng chiếu vuông góc với mặt bản mỏng thuỷ tinh có độ dày không đổi là 0,40 um và có chiết suất 1,50 đặt trong không khí. Cho biết quang phổ của ánh sáng trắng gồm mọi ánh sáng đơn sắc có bước sóng từ 0,40 um đến 0,76 um. Hỏi chùm sáng phản xạ đơn sắc nào trong chùm sáng được tăng cường?

Avoltaic cell converts chemical energy to

Amass attached to a spring is displaced from its equilibrium position by 5cm and released. the system then oscillates in simple harmonic motion with a period of 1s. if that same mass–spring system is displaced from equilibrium by 10cm instead, what will its period be in this case? a mass attached to a spring is displaced from its equilibrium position by and released. the system then oscillates in simple harmonic motion with a period of . if that same mass–spring system is displaced from equilibrium by instead, what will its period be in this case? a) 0.5sb) 2sc) 1sd) 1.4s

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.