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Igcse_physic_waves_part ii (Example)

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Section 3 Waves Revision Questions and Answers Q1:¬†¬†The¬†diagram¬†represents¬†the¬†electromagnetic¬†spectrum. Gamma-rays X-rays Ultraviolet Visible Infra-red Microwaves Radio waves (a)¬†¬†Which¬†of¬†X-rays¬†and¬†radio¬†waves¬†has¬†the¬†longer¬†wavelength? ANS.- Radio waves (b)¬†¬†Which¬†of¬†X-rays¬†and¬†radio¬†waves¬†has¬†the¬†higher¬†frequency? ANS. -X-rays (c)¬†¬†State¬†one¬†use¬†of¬†X-rays. ANS. - Observing internal structure of objects/ medical applications - Looking at bones/ body scans (d)¬†State¬†one¬†property¬†that¬†all¬†electromagnetic¬†waves¬†have¬†in¬†common. ANS. -Same speed -Travel in a vacuum -Both transverse -Can be polarized. (e)¬†¬†State¬†the¬†law¬†of¬†reflection. ANS. Angle of incidence = angle of reflection or incident and reflected rays and normal all in same plane (f)¬†¬†A¬†teacher¬†wants¬†to¬†demonstrate¬†the¬†law¬†of¬†reflection¬†to¬†his¬†class. Suggest¬†two¬†reasons¬†why¬†he¬†should¬†use¬†visible¬†light¬†rather¬†than¬†X-rays. ANS. ‚Äď Visible ora - X-ray are dangerous ora - Equipment not readily available ora Q2: The diagram shows an example of an analogue signal and an example of a digital signal. Complete¬†the¬†sentences. (a)The¬†analogue¬†signal¬†varies continuously¬†between¬†a¬†maximum¬†and minimum¬†value. (b)The¬†digital¬†signal¬†only¬†has¬†two¬†values.¬†¬†These¬†are¬†1¬†which¬†corresponds¬†to¬†ON and¬†Zero which¬†corresponds¬†to¬†OFF. Q3: (a)¬†Astudent¬†uses¬†a¬†rectangular¬†glass¬†block¬†to¬†determine¬†the¬†refractive¬†index¬†of¬†the glass. Describe¬†the¬†experiment.¬†¬†Draw¬†a¬†diagram¬†to¬†illustrate¬†your¬†answer. ANS. Any of the following Glass block (placed) on a suitable background Either use of ray box or use of pins and eye Position of block and rays marked or shown on (i) State the relationship between i r and refractive index n. (ii) Calculate a value for refractive index using set 1. Refractive index = sin 50/ sin30=1.532 (iii)State why set 2 give a less reliable value. The angles are small and difficult to measure accurately. Q27:¬†¬†The¬†diagram¬†shows¬†a¬†waveform¬†on¬†an¬†oscilloscope¬†screen. The time base is set at 0.02s per division. Determine the frequency of this wave and give its unit. Frequency =1/0.02=50Hz A teacher demonstrated a method for determining the speed of sound. He hit two metal together to produce a sound. The sound was detected by two microphones connected to oscilloscope. The screen of the oscilloscope showed two signals A and B corresponding to the sound received by the two microphones. The¬†time¬†between¬†the¬†signals¬†was¬†0.002s¬†and¬†the¬†distance¬†between¬†the¬†microphones was¬†0.680¬†m. (i) Calculate¬†the¬†speed¬†of¬†sound¬†in¬†m/s. Frequency = 2/0.002=1000Hz wavelength = 0.680m Using v¬†=¬†f¬†őĽ Speed¬†=¬†680 m/s (ii)¬†¬†State¬†which¬†property¬†of¬†a¬†sound¬†wave¬†is¬†represented¬†by¬†the¬†amplitude¬†of¬†the signals. Loudness. (iii)¬†¬†Suggest¬†an¬†explanation¬†for¬†the¬†relative¬†sizes¬†of¬†the¬†amplitudes¬†of¬†A¬†and¬†B. The tow metals produced sound of two different volumes. A is louder than B. [...]

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This is payment for Part II of the project Topic as discussed in part I FOr INVITED writer only Not for un-invited writer biding or aution Thanks

Subject Area: Physics

Document Type: Paraphrasing

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Project's rating is 5/5

Price $75

Words 2750

Pages 10

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01.23.2017

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