76 The Diagram Below Shows Two Wave Pulses X And Y Approaching One Another Which Of The Following Diagrams Best Repr 1 (36.96 KiB) Viewed 8 times
76 The Diagram Below Shows Two Wave Pulses X And Y Approaching One Another Which Of The Following Diagrams Best Repr 2 (42.36 KiB) Viewed 8 times
76) The diagram below shows two wave pulses, X and Y, approaching one another. Which of the following diagrams best represents the appearance of the resultant wave when the centres of the pulses coincide? B А 0 D E 77) The value of the speed of sound outside in Markham is on average, usually the a) largest in the spring b) largest in the summer c) largest in the autumn d) largest in the winter e) same for all seasons 78) What type of vibration exists when the object vibrates perpendicular to its axis? a) longitudinal b) tensional c) transverse d) vertical 79) Sound waves cannot travel in: a) air b) water c) steel d) a vacuum c) sound can travel in all of the above
80) The period of a sound wave from a piano is 1.18 x 10-3 s. If the speed of the wave in air is 3.4 x 10 m/s, its wavelength must be: a) 0.40 m b) 2.88 x 10 m c) 0.60 m d) 1.00 m e) none of the above 81) The distance between two successive crests in a vibrating string is 10 cm. The frequency of the source is 30 Hz. The speed of the wave is: a) 3.0 x 10 m/s b) 1.0 x 10 m/s c) 2.0 x 10 m/s d) 8.0 x 10 m/s e) none of the above 82) Which of the following means: "wave that consists of a single disturbance”? c) a) amplitude b) wavelength period d) pulse 83) While sending waves down a spring, the number of times you move your hand every second determines the a) frequency b) wavelength c) speed d) amplitude e) none of the above
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