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Tutor HuntTest QuestionsPhysics QuestionsYear 10 Physics Questions

 

Sound Waves (physics Only) (ht Only) (GCSE Physics)

The following is a GCSE Physics test covering 'Sound Waves (physics Only) (ht Only)' from the broader topic Waves. The test is geared towards the AQA exam board style syllabus.
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Below a typical questions that will be covered in this test. You final score will be logged on your account

A moving-coil microphone (like the one in the exam diagrams) converts sound pressure variations into an electrical signal by moving a coil in a magnetic field. Which physical law describes the force on the coil that causes it to move?
A whistle on an ambulance emits frequency f0 = 700 Hz. A stationary observer hears 700 Hz. If the ambulance approaches the observer at 30 m/s and c = 343 m/s, what approximate frequency does the observer hear? f` = f0 (c/(c - v_source)) for moving source; choose correct approx.
A student measures phase difference between two coherent sources and finds 180° (p radians). What kind of interference will occur at a point equidistant from the sources?
A tube open at both ends supports a standing sound wave whose fundamental frequency is 256 Hz. If the speed of sound is 340 m/s, what is the length of the tube? (For an open–open tube the fundamental has ? = 2L.)
A student measures a sound level of 60 dB and another of 90 dB. How many times larger is the intensity (power per unit area) of the 90 dB sound compared with the 60 dB sound? (Use 10 log10 rule.)
A room has a single-frequency standing sound wave set up. If two adjacent nodes are 0.25 m apart, what is the wavelength of the standing wave? (Node–node distance = ?/2)
A plane wave in air of wavelength 0.34 m strikes a rigid wall. Which two statements are correct about the reflected wave?
A sound wave in air has frequency 500 Hz and intensity I0. If the amplitude of pressure oscillation is doubled, what is the new intensity in terms of I0? (Intensity ? amplitude^2.)
A moving listener hears frequency f` from a stationary source frequency f due to the Doppler effect. If the listener moves toward the source at speed v_l (<< speed of sound c), which approximate relation applies?
A sound source radiates 0.5 W of acoustic power uniformly. What intensity is at a distance of 2 m? I = P / (4pr^2).
An ultrasound pulse (1 MHz) is emitted into tissue where speed is 1540 m/s. What is the pulse wavelength in tissue?