1 (a) Sound and light are different types of waves.
Give twosimilarities and two differences between sound waves and light waves
1 (b) i : When a sound wave with a frequency of 4800 hertz passes through one of the liquids, it has a wavelength of 0.25 m.
Calculate the speed of the wave and identify the liquid used.
Use the correct equation from the Physics Equations Sheet.
Show clearly how you work out your answer.
Click on the calculator icon and you'll be able to show your working
Was the student’s hypothesis completely correct?
Give reasons for your answer.
2 (a) Suggest three changes the student should make to this method to get valid results.
2(b) The student used a thermometer to measure the temperature of the water inside each bag.
What was the resolution of the thermometer?
Suggest one reason why the temperatures increased less on Day 2 than on Day 1 and Day 3.
P and Q sound different. Write down two differences in the way they sound. Explain your answers as fully as you can.
Q4. Compare the percentages of incident light transmitted through the two different fibres over the range of wavelengths shown.
Q5 (a) Compare the properties of the waves that transmit images and noises from the monitor unit.
Q5 (b) The sensor unit can detect infrared and visible light.
Suggest one advantage of being able to detect infrared.
Write down the equation that links frequency, wave speed and wavelength.
2 (c) Calculate the mean temperature increase for the white bag.
Which colour of bag would be best to use to heat water?
Give a reason for your answer.
5 (d) The signals for the monitor unit are transmitted as electromagnetic waves with a wavelength of 0.125 m.
Wave speed of electromagnetic waves = 3 × 108 m / s
Calculate the frequency of the signal.
Q6 (a) Give two more properties that are the same for both radio waves and microwaves.
Q6 (b) Some satellites are used to transmit television programmes. Signals are sent to, and transmitted from, the satellites using microwaves.
What is the property of microwaves that allows them to be used for satellite communications?
Q6 (c) Electromagnetic waves travel at a speed of 3.0 × 108 m/s.
A radio station transmits waves with a wavelength of 2.5 × 102 m.
Calculate the frequency of the radio waves.
Show clearly how you work out your answer and give the unit.