(i) A typical LED lamp has a luminous efficacy of 74 lumens per watt of electricity consumed. Calculate how many watts of electricity would be required by a lantem providing equivalent light output to the kerosene lamp in part (d). (1 mark) (ii) A typical D Cell rechargeable torch battery can hold 3.5 watt-hours of electricity. How many such cells would be required to operate such an equivalent lantern for 4.0 hours a day for a week? ( 2 marks) (iii) It is estimated that globally kerosene lamps consume 80 thousand million litres of kerosene fuel per year. If the properties of the kerosene lamp above were to be regarded as typical of them, roughly how many million battery lanterns would need to be manufactured to replace them all? (i) A typical LED lamp has a luminous efficacy of 74 lumens per watt of electricity consumed. Calculate how many watts of electricity would be required by a lantem providing equivalent light output to the kerosene lamp in part (d). (1 mark) (ii) A typical D Cell rechargeable torch battery can hold 3.5 watt-hours of electricity. How many such cells would be required to operate such an equivalent lantern for 4.0 hours a day for a week? ( 2 marks) (iii) It is estimated that globally kerosene lamps consume 80 thousand million litres of kerosene fuel per year. If the properties of the kerosene lamp above were to be regarded as typical of them, roughly how many million battery lanterns would need to be manufactured to replace them all