Electromagnetic waves are classified by distance between waves.

Electromagnetic Waves

There are different groups of waves in the electromagnetic spectrum.(a) Figure 1 shows the position of three groups of the waves.Figure 1A Microwaves B Visible light C D Gamma raysWhich letter shows the position of infrared?Tick (✓✓✓✓) one box.A B C D(1)A student investigated how the colour of a surface affects the amount of infrared the surfaceabsorbs.Figure 2 shows the equipment used.Figure 21.Page 1 of 51Waves (F)(b) Complete the sentence.Choose the answer from the box.a control the dependent the independentIn this investigation the distance between each flask and the infrared heateris ____________________ variable.(1)(c) The student wrote the hypothesis:‘Surface colour of the flask affects the amount of infraredabsorbed when the heater is switched on for five minutes.’Describe how the equipment in Figure 2 could be used to test this hypothesis.____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________(4)The table below shows the results.Colour of flaskTemperature increase in °CTest 1 Test 2 Test 3Black 19 17 27Silver 10 12 11Page 2 of 51Waves (F)(d) Which one of the results for the black flask is anomalous?___________________________________________________________________(1)(e) The anomalous result was caused by reading the thermometer incorrectly.What should the student do with the anomalous result?______________________________________________________________________________________________________________________________________(1)(f) Calculate the mean temperature increase for the silver flask.______________________________________________________________________________________________________________________________________Mean temperature increase = ____________________ °C(1)(g) What conclusion can be made from the table above?Tick (✓✓✓✓) one box.Both flasks absorbed the same amount of infrared during the five minutes.The black flask absorbed the most infrared during the five minutes.The silver flask absorbed the most infrared during the five minutes.(1)(Total 10 marks)Page 3 of 51Waves (F)The data given in the table below was obtained from an investigation into the refraction of light atan air to glass boundary.Angle of incidence Angle of refraction20° 13°30° 19°40° 25°50° 30°Describe an investigation a student could complete in order to obtain similar data to that given inthe table above.Your answer should consider any cause of inaccuracy in the data.A labelled diagram may be drawn as part of your answer.______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________(Total 6 marks)2.Page 4 of 51Waves (F)A student investigated how the magnification produced by a convex lens varies with the distance(d) between the object and the lens.The student used the apparatus shown in Figure 1.Figure 13.(a) The student measured the magnification produced by the lens by measuring the imageheight in centimetres.Explain why the image height in centimetres was the same as the magnification.____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________(2)Page 5 of 51Waves (F)(b) The data recorded by the student is given in Table 1.Table 1Distance between theobject and the lens in cm Magnification25 4.030 2.040 1.050 0.760 0.5It would be difficult to obtain accurate magnification values for distances greater than 60cm.Suggest one change that could be made so that accurate magnification values could beobtained for distances greater than 60 cm.______________________________________________________________________________________________________________________________________(1)Page 6 of 51

Which of the following describes the distance at which an electromagnetic force can have an effect?Distance varies according to environmentDistance is limitlessDistance is determined by the mass of the objectDistance is short

Jasmine is investigating radiant energy from the sun. She identifies different kinds of electromagnetic waves, and she notices that although most are not visible to the human eye, they share many properties. Read each description of wave properties. Drag each description into the correct box. the distance a wave travels before repeating the distance a wave travels in a certain amount of time the number of waves that pass a given point in a certain amount of time half the veritcal distance from the trough to the crest of a wave Frequency Wavelength Speed Amplitude

If E and B represent electric and magnetic field vectors of the electromagnetic waves respectively, then the direction and magnitude of propagation of the electromagnetic wave is given as ......*1 pointE.HH.E(E x B)/μ0B x H