A dolphin produces a sound wave in water of frequency 7800 Hz.Fig. 6.1 represents rarefactions of the sound wave travelling in the water and hitting the side of awooden ship at an angle.water woodBArarefactionsdirection of wave travelFig. 6.1(a) State what is meant by a rarefaction...................................................................................................................................................................................................................................................................................................[1](b) On Fig. 6.1, two rarefactions A and B are labelled. The distance between rarefaction A andrarefaction B is 0.76 m.Determine(i) the wavelength in water of the sound wave,wavelength = ...........................................................[1](ii) the time taken for the rarefaction at A to reach the point where rarefaction B is nowpositioned.time = .........................................................

The dolphin emits sound at a frequency of 87.287.2 kHz, and the sound waves move through the water at 14801480 m/s.What is the wavelength of the sound waves emitted by the dolphin? Enter your answer accurate to at least 3 significant figures.

The sound wave passes from the sea-water into the air.State what happens, if anything, to• the frequency of the sound, ...............................................................................................................................................................................................................• the speed of the sound. .....................................................................................................................................................................................................................[2][Total: 8]PhysicsAndMathsTutor.com

Which statement correctly describes the characteristics of the waves used by advanced canes and dolphins? A. The higher the pitch, the higher the amplitude. B. The higher the pitch, the higher the frequency. C. The lower the pitch, the lower the amplitude. D. The lower the pitch, the shorter the wavelength.

A drum is struck, producing a wave with a wavelength of 1.10 meters and a speed of 343 m/s. What is the frequency of the wave? 3. Sonar is a device that uses reflected sound waves to measure underwater depths. If a sonar signal has a frequency of 288 Hz and the speed of sound in water is 1,498 m/s, what is the wavelength of the sonar signal? 4. A dog whistle is designed to produce a sound with a frequency beyond that which can be heard by humans. If a particular whistle produces a sound with a frequency of 2.5x10 4Hz, what is the sound’s wavelength? Assume the speed of sound in air is 343 m/s. Electromagnetic Waves: 5. [Radio waves] A certain FM radio station broadcasts electromagnetic waves at a frequency of 9.05x10 7Hz. These radio waves travel at a speed of 3x10 8m/s. What is the wavelength of these radio waves? 6. [Visible light] A student asks your physics teacher what his favorite color is. Your teacher provides the following straightforward and understandable response: “The wavelength of light that corresponds with my favorite color is 623 nanometers”. Use the speed of light to calculate the frequency that corresponds to this wavelength. 7. Using values from this assignment: How does the speed of sound in air compare to the speed of sound in water? 8. Using values from this assignment: How do the speed of sound and light compare? 1.31 meters .+

The sound wave passes from the water into the wood where the speed of sound is greater.State what happens to(i) the frequency,.......................................................................................................................................[1](ii) the wavelength........................................................................................................................................[1](d) On Fig. 6.1, sketch the positions in the wood of the three incomplete rarefactions. [2][Total: 8]PhysicsAndMathsTutor.com