1 Which of the following summarises the change in wave characteristics on going from infra-red to ultraviolet in the electromagnetic spectrum?

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1 Which of the following summrises the chnge in wve chrcteristics on going from infr-red to ultrviolet in the electromgnetic spectrum? frequency speed (in vcuum) decreses decreses decreses remins constnt increses remins constnt increses increses 2 The digrm shows cthode-ry oscilloscope trce of sound wve. The time-bse is clibrted t 2. ms cm. Wht is the frequency of the sound wve? 62.5 Hz 25 Hz 25 Hz 5 Hz 3 Which sttement correctly reltes the intensity of sound wve to the vibrtions of the molecules? intensity α mplitude intensity α (mplitude) 2 intensity α intensity α () 2 ompiled nd rerrnged by Sjit hndr Shky

2 2 4 Electromgnetic wves of wvelength λ nd frequency f trvel t speed c in vcuum. Which of the following describes the wvelength nd speed of electromgnetic wves of frequency f /2? wvelength speed in vcuum λ /2 c /2 λ /2 c 2λ c 2λ 2c 5 sound wve is displyed on the screen of cthode-ry oscilloscope. The time bse of the c.r.o. is set t 2.5 ms / cm. cm Wht is the frequency of the sound wve? 5 Hz Hz 2 Hz 4 Hz 6 When the light from two lmps flls on screen, no interference pttern cn be obtined. Why is this? The lmps re not point sources. The lmps emit light of different mplitudes. The light from the lmps is not coherent. The light from the lmps is white. ompiled nd rerrnged by Sjit hndr Shky

3 3 7 Which of the following is true for ll trnsverse wves? They re ll electromgnetic. They cn ll be polrised. They cn ll trvel through vcuum. They ll involve the oscilltion of toms. 8 The grph represents sttionry wve t two different times. X Y distnce long the wve Wht does the distnce XY represent? hlf the mplitude hlf the frequency hlf the period hlf the wvelength 9 Which observtion indictes tht sound wves re longitudinl? Sound cn be reflected from solid surfce. Sound cnnot be polrised. Sound is diffrcted round corners. Sound is refrcted s it psses from hot ir to cold ir. helth inspector is mesuring the intensity of sound. Ner loudspeker his meter records n intensity I. This corresponds to n mplitude of the sound wve. t nother position the meter gives n intensity reding of 2 I. Wht is the corresponding sound wve mplitude? ompiled nd rerrnged by Sjit hndr Shky

4 4 The digrm shows trnsverse wve on rope. The wve is trvelling from left to right. t the instnt shown, the points P nd Q on the rope hve zero nd mximum respectively. Q P direction of wve Which of the following describes the direction of motion, if ny, of the points P nd Q t this instnt? point P point Q downwrds sttionry sttionry downwrds sttionry upwrds upwrds sttionry 2 plne wve of mplitude is incident on surfce of re S plced so tht it is perpendiculr to the direction of trvel of the wve. The energy per unit time reching the surfce is E. The mplitude of the wve is incresed to 2 nd the re of the surfce is reduced to 2 S. How much energy per unit time reches this smller surfce? 4E 2E E E 2 3 Wht is the pproximte rnge of frequencies of infr-red rdition? x 3 Hz to x 9 Hz x 9 Hz to x Hz x Hz to x 4 Hz x 4 Hz to x 7 Hz ompiled nd rerrnged by Sjit hndr Shky

5 5 4 sound wve is set up in long tube, closed t one end. The length of the tube is djusted until the sound from the tube is loudest. Wht is the nture of the sound wve in the tube? longitudinl nd progressive longitudinl nd sttionry trnsverse nd progressive trnsverse nd sttionry 5 Wht do not trvel t the speed of light in vcuum? electrons microwves rdio wves X-rys 6 The number of wvelengths of visible light in one metre is of the order of Where, in stnding wve, do the vibrtions of the medium occur? only t the nodes only t the ntinodes t ll points between the nodes t ll points between the ntinodes 8 Sound wves, emitted by smll loudspeker, re reflected by wll. The frequency f of the wves is djusted until sttionry wve is formed with the ntinode nerest the wll t distnce x from the wll. Which expression gives f in terms of x nd the speed of sound c? 4 f = c x f = 2c x c f = 2 x c f = 4 x ompiled nd rerrnged by Sjit hndr Shky

6 6 9 Which phenomenon is ssocited with trnsverse wves but not longitudinl wves? polristion reflection refrction superposition 2 -time grph is shown for prticulr wve. time second wve of similr type hs twice the intensity nd hlf the frequency. When drwn on the sme xes, wht would the second wve look like? time time time time 2 The frequency of certin wve is 5 Hz nd its speed is 34 m s. Wht is the phse difference between the motions of two points on the wve.7 m prt? π rd π rd 3π rd π rd ompiled nd rerrnged by Sjit hndr Shky

7 7 22 Which of the following types of wve cn be polrised? longitudinl progressive wve longitudinl sttionry wve trnsverse sttionry wve trnsverse sound wve 23 Sound wve X hs intensity 2 times greter thn tht of sound wve Y. y how much is the mplitude of X greter thn the mplitude of Y? 6 times times 5 times 2 times 24 The grph shows the shpe t prticulr instnt of prt of trnsverse wve trvelling long string. P Q R S distnce long string Which sttement bout the motion of points in the string is correct? The speed t point P is mximum. The t point Q is lwys zero. The energy t point R is entirely kinetic. The ccelertion t point S is mximum. 25 Polristion is phenomenon ssocited with certin type of wve. Which condition must be fulfilled if wve is to be polrised? It must be light wve. It must be longitudinl wve. It must be rdio wve. It must be trnsverse wve. ompiled nd rerrnged by Sjit hndr Shky

8 8 26 The digrm illustrtes prt of the electromgnetic spectrum. high frequencies visible 2 low frequencies Which lbels re correct for the regions mrked nd 2? 2 infrred X-rys microwves X-rys ultrviolet microwves X-rys infrred 27 The digrm represents sttionry wve on stretched string. x Wht is represented by point P nd by the length x? P point P length x ntinode one wvelength ntinode two wvelengths node one wvelength node two wvelengths 28 wve motion is described by the oscilltion of prticles. Wht is the nme given to the number of complete oscilltions of prticle in one second? mplitude frequency wvelength wve speed ompiled nd rerrnged by Sjit hndr Shky

9 9 29 wve of mplitude hs n intensity of 3. Wm 2. Wht is the intensity of wve of the sme frequency tht hs n mplitude 2? 4.2 Wm 2 6. Wm 2 9. Wm 2 2 Wm 2 3 The grph shows how the height of wter surfce t point in hrbour vries with time t s wves pss the point. height men height p t q Wht re p nd q? p q wvelength period mplitude wvelength mplitude period 3 The intensity I of sound t point P is inversely proportionl to the squre of the distnce x of P from the source of the sound. Tht is I x. 2 source of sound S P Q r 2r ir molecules t P, distnce r from S, oscillte with mplitude 8. µm. Point Q is situted distnce 2r from S. Wht is the mplitude of oscilltion of ir molecules t Q?.4 µm 2. µm 2.8 µm 4. µm ompiled nd rerrnged by Sjit hndr Shky

10 32 The four grphs represent progressive wve on stretched string. Grphs nd show how the d vries with distnce x long the string t one instnt. Grphs nd show how the d vries with time t t prticulr vlue of x. The lbels on the grphs re intended to show the wvelength λ, the period T, nd the mplitude of the wve, but only one grph is correctly lbelled. Which grph is correctly lbelled? λ d T x d x d λ t d T t 33 The grph shows how the of prticle in wve vries with time. /cm time/s 2 Which of the following is correct? The wve hs n mplitude of 2 cm nd could be either trnsverse or longitudinl. The wve hs n mplitude of 2 cm nd must be trnsverse. The wve hs n mplitude of 4 cm nd could be either trnsverse or longitudinl. The wve hs n mplitude of 4 cm nd must be trnsverse. ompiled nd rerrnged by Sjit hndr Shky

11 34 sttionry sound wve hs series of nodes. The distnce between the first nd the sixth node is 3. cm. Wht is the wvelength of the sound wve? 5. cm 6. cm. cm 2. cm 35 Which of the following pplies to progressive trnsverse wve? trnsfers energy cn be polrised no no no yes yes no yes yes 36 Which of the following my be used to produce sttionry wves? blowing ir over the top of n empty bottle mking loud sound ner mountin pssing monochromtic light through double slit pssing wter wves through nrrow slit 37 -time grph for trnsverse wve is shown in the digrm. X time Y The phse difference between X nd Y cn be expressed s nπ. Wht is the vlue of n? ompiled nd rerrnged by Sjit hndr Shky

12 2 38 The digrm represents sttionry wve on stretched string. x Wht is represented by point P nd by the length x? P point P length x ntinode one wvelength ntinode two wvelengths node one wvelength node two wvelengths 39 Which of the following is longitudinl wve? light wve trvelling through ir rdio wve from brodcsting sttion ripple on the surfce of wter sound wve trvelling through ir 4 sttionry sound wve is set up long the line joining two loudspekers. Which mesurement is sufficient on its own to enble you to deduce the wvelength of the wve? the mplitude of the sound wve the distnce between the two loudspekers the distnce between two djcent ntinodes the frequency of the sound wve 4 wve of mplitude 2 mm hs intensity I X. nother wve of the sme frequency but of mplitude 5 mm hs intensity I Y. Wht is I I X Y? ompiled nd rerrnged by Sjit hndr Shky

13 42 The grph represents stnding wve t two different times. 3 X Y distnce long the wve Wht does the distnce XY represent? hlf the mplitude hlf the frequency hlf the period hlf the wvelength 43 sound wve hs y t distnce x from its source t time t. Which grph correctly shows the mplitude nd the wvelength λ of the wve? y λ y λ distnce x distnce x y λ y λ time t time t ompiled nd rerrnged by Sjit hndr Shky

14 4 44 The intensity of progressive wve is proportionl to the squre of the mplitude of the wve. It is lso proportionl to the squre of the frequency. The vrition with time t of x of prticles in medium, when two progressive wves P nd Q pss seprtely through the medium, re shown on the grphs. x wve P x wve Q 2x x x t 2t t t 2t t The intensity of wve P is I. Wht is the intensity of wve Q? ½ I I 8I 6 I 45 sound wve of frequency 5 Hz trvels in wter t speed of 5 m s. It then trvels through the surfce of the wter nd into ir, where its speed is 3m s. Which line in the tble gives the correct vlues for the wvelengths of the sound in wter nd in ir? wvelength in wter / m wvelength in ir / m n electromgnetic wve hs frequency of 8 Hz. In which region of the electromgnetic spectrum does the wve occur? infr-red rdio ultrviolet visible ompiled nd rerrnged by Sjit hndr Shky

15 5 47 The grph represents sinusoidl wve in the se, trvelling t speed of 8. m s, t one instnt of time. The mximum speed of the oscillting prticles in the wve is 2πf, where is the mplitude nd f is the frequency. / m 2 P 5 position / m 2 n object P of mss 2. 3 kg flots on the surfce. Wht is the mximum kinetic energy of P due to the wve? ssume tht its motion is verticl..26 mj 4. mj 39 mj 64 mj 48 Which vlue is possible wvelength for rdition in the microwve region of the electromgnetic spectrum? 3 2 m 3 5 m 3 8 m 3 m 49 The digrm represents the screen of cthode-ry oscilloscope displying two sound wves lbelled X nd Y. X Y Wht is the rtio 9 intensity of sound wve X? intensity of sound wve Y 3 3 ompiled nd rerrnged by Sjit hndr Shky

16 5 The digrm represents the screen of cthode-ry oscilloscope displying two sound wves lbelled X nd Y. 6 X Y Wht is the rtio intensity of sound wve X? intensity of sound wve Y The digrm shows two wves X nd Y. wve X wve Y time Wve X hs mplitude 8 cm nd frequency Hz. Wht re the mplitude nd frequency of wve Y? mplitude / cm frequency / Hz ompiled nd rerrnged by Sjit hndr Shky

17 7 47 Light cn exhibit ll of the properties listed. Which property cn sound not exhibit? interference polristion refrction totl internl reflection 48 Wht is the reltionship between the intensity I nd the mplitude of wve? I I 2 = constnt = constnt I = constnt I 2 = constnt ompiled nd rerrnged by Sjit hndr Shky