Waves

Question 10:Figure 9 shows the pattern of interference produced by three coloured lights in an experiment.Table 1 shows the coloured lights used in this experiment and the values of wavelength. Complete Table 1 by matching the coloured lights with patterns A, B and C.Justify your answer. Answer:$$ \lambda=\frac{a x}{D} \quad \text { Therefore, } x=\frac{\lambda … Read more

Question 8:Figure 7 shows an image of water waves moving from a deep water region to a shallow water region.(a) In Figure 7, draw the pattern of wavefront in region A and region B.(b) Given that the speed of water waves in the shallow water region and deep water region are 4.0 m s–1 and … Read more

Question 5:Seorang murid menggetarkan suatu spring slinki pada frekuensi 5 Hz supaya gelombang melintang yang terhasil adalah seperti yang ditunjukkan dalam Rajah 5.(a) Determine the amplitude, period and wavelength of the wave. (b) Calculate the wave speed along the slinky spring. Answer:(a)Amplitude is the maximum displacement from its equilibrium position.∴ Amplitude = 15 cm$$ \begin{aligned} &\begin{aligned} … Read more

Question 3:Figure 3 shows superposition of two coherent plane waves.(a) What is a coherent wave?(b) State the points where the following occur(i) constructive interference,(ii) destructive interference.(c) Explain with suitable diagrams, interference at point (i) Q,(ii) R, and(iii) S.Answer:(a) Coherent waves are waves that have:– same frequency– constant phase difference(b)(i) Constructive interference occurs when two crests … Read more

Question 1:Figure 1 shows a port and the area around it.(a) State the wave phenomena that occur when sea waves(i) collide with the embankment of the port at A,(ii) move towards the beach at B, and(iii) pass through the entrance of the port at C.(b) Draw the wavefronts after the waves pass C.(c) What is … Read more

Question 1:Figure 5.71 shows an electromagnetic spectrum.What are waves A, B and C? Answer:$$ \begin{aligned} & A=\text { Gamma ray } \\ & B=\text { Ultraviolet ray } \\ & C=\text { Microwave } \end{aligned} $$ Question 2:Arrange the electromagnetic waves below according to the order of increasing frequency. Answer: Question 3:In the air, blue … Read more

Question 1:Figure 5.67 shows Young’s double-slit experiment.(a) State the phenomenon that occurs when light passes through the single slit.(b) What will happen to the two light rays in the area PQ on the screen?(c) Describe the formation of bright fringes and dark fringes.(d) In the apparatus set up of this experiment, a = 0.30 mm, … Read more

Question 1:Complete the following diagrams by drawing the patterns of diffracted waves. Answer:(a)(b)(c)(d) Question 2:Figure 5.54 shows a plan of the living room and bedroom. A child lying on the bed cannot see the television in the living room but can still hear the sound from the television.(a) By drawing wavefronts, explain how the phenomenon … Read more

Question 1:What phenomenon of waves happens when sea waves are approaching the beach? Explain your answer with the help of a diagram. Answer:The phenomenon of refraction of sea waves :– When the wavefront of the water propagates to the cape, the speed of the water waves decreases causing the wavelength to be shorter.– Wavefront of … Read more

Question 1:Copy Figure 5.32 and draw the wavefront and the direction of the reflected water waves. Answer: Question 2:Figure 5.33 shows the use of ultrasonic waves by a ship to determine the depth of the sea. The interval time between transmission and receiving of echo of the ultrasonic sound is 0.06 seconds. Speed of the … Read more