Lamp is to light as faucet is to:*WaterElectricityOilGas

The power with which light is emitted from a lamp is called*

the component in a photoelectric sensors that senses light is the ______.

Describe how the student could use her circuit to investigate how the currentthrough a filament lamp affects its resistance

Some microscopes have a built-in lamp. Others have

A student investigates the efficiency of a filament lamp. Fig. 4.1 shows the filament lamp with itsglass bulb immersed in water in a beaker.filament lampto power supplywaterbeakerthermometerFig. 4.1The reading on the thermometer in the water is 19.0 °C.Only the glass of the lamp is in contact with the water and the electrical connections are completelyinsulated.The lamp is switched on.At the end of the experiment, the temperature of the water is 21.5 °C.(a) The mass of the water in the beaker is 600 g and the specific heat capacity of water is4200 J / (kg °C).(i) Show that the increase in the internal energy of the water is 6300 J.[3](ii) In the experiment, the lamp is switched on for 500 s. The power supplied to the filamentlamp is 13 W. The useful energy from the lamp is transferred as light. The energy thatincreases the temperature of the water is wasted energy.Determine the maximum possible efficiency of the filament lamp.maximum possible efficiency = ......................................................... [4]90625/41/M/J/23©UCLES 2023 [Turn over(b) The efficiency of the lamp is less than the value determined in (a)(ii).Suggest one reason for this.................................................................................................................................................................................................................................................................................................................................................................................................................................................... [1]