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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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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 tube closed at one end has its first resonance (fundamental) at 170 Hz. If the speed of sound is 340 m/s, what is the length of the tube? (For closed–open tube fundamental ? = 4L.)
An open pipe supports a standing wave with first overtone (second harmonic) at frequency 600 Hz. What is the fundamental frequency?
A sound wave in air with frequency 1000 Hz has RMS pressure amplitude p_rms. If p_rms doubles, by what factor does sound intensity level in dB change? (Intensity ? p_rms^2; change in dB = 10 log10(I2/I1)).
A closed–open tube of length L resonates at f1 (fundamental). Which harmonic series is produced?
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 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 moving-coil loudspeaker uses alternating current in a coil placed in a permanent magnetic field. Which property of the output sound is changed by increasing the amplitude of the alternating current (keeping frequency constant)?
A plane wave in air of wavelength 0.34 m strikes a rigid wall. Which two statements are correct about the reflected wave?
Inside the ear, which structure converts pressure variations in the cochlear fluid into nerve impulses?
A loudness level L in decibels (dB) is defined by L = 10 log10(I/I0) where I0 is a reference intensity. If a sound’s intensity is 100 times the reference, what is its level in dB?