3.4. Sound
A subsection of Physics, 5054, through 3. Waves
Listing 10 of 120 questions
shows a loudspeaker inside a glass bell-jar that contains air. air tube loudspeaker glass bell-jar The loudspeaker produces a sound of frequency 2200 Hz. State what is meant by the frequency of a sound. The speed of sound in air is 330 m / s. Calculate the wavelength of the sound in the air. wavelength = The sound passes from the air into the glass. State what happens to 1. the frequency of the sound, 2. the speed of the sound. Describe 1. how sound is produced by the loudspeaker, 2. how sound is transmitted through the air. A pump is connected to the tube at the bottom of the glass bell-jar. The pump is switched on and it removes the air from the glass bell-jar. Explain why the volume of the sound heard outside the glass bell-jar decreases.
5054_w16_qp_21
THEORY
2016
Paper 2, Variant 1
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A loudspeaker is made from a coil of wire fixed to a cardboard tube. The tube is attached to a cardboard cone. shows part of the arrangement of the loudspeaker. cardboard tube cardboard cone coil When there is a current in the coil, the coil experiences a force. State what else is needed in a loudspeaker to make a current-carrying wire experience a force. A student connects the coil to the output of an alternating current (a.c.) generator. shows how the electromotive force (e.m.f.) produced by the generator varies with time. –4.0 time / s time / s –2.0 2.0 4.0 e.m.f./ V 0.005 0.010 0.015 0.020 The coil, tube and cone vibrate backwards and forwards. Explain why the e.m.f. shown in makes the coil vibrate. The vibrating cone produces sound in the surrounding air. Explain, in terms of molecules, how the cone produces a sound wave that travels through the air. Sound is a longitudinal wave. Describe the difference between a longitudinal wave and a transverse wave. Using , determine the number of times that the cone reverses its direction of motion in 1.0 s. number = The speed of sound in air is 340 m / s. Calculate the wavelength of the sound. wavelength = The student adjusts the generator so that the maximum voltage of the output is now 3.0 V. Everything else stays the same as the output shown on the graph in . Explain any effect on the loudness of the sound. Explain any effect on the pitch of the sound.
5054_w21_qp_21
THEORY
2021
Paper 2, Variant 1
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The loudspeaker shown in produces a sound of frequency 800 Hz. cone power supply loudspeaker sound of frequency 800 Hz State what is meant by ‘frequency’. Explain whether the sound produced by the speaker is audible to a human with healthy hearing. Describe the motion of the cone in and explain how this causes the production of sound. The Sun is a very large and extremely violent ball of gas. Electromagnetic radiation from explosions on the surface of the Sun reaches the Earth. Explain why sound from explosions on the surface of the Sun does not reach the Earth.
5054_w23_qp_22
THEORY
2023
Paper 2, Variant 2
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shows how ultrasound is used to produce an image of the heart. ultrasound heart ultrasound transmitter and detector Define ultrasound. The ultrasound has a wavelength of 1.2 × 10–3 m. The speed of the ultrasound in the human body is 1500 m / s. Calculate the frequency of the ultrasound. frequency = ………………………………… Ultrasound is a longitudinal wave. Describe how particles in the body move as the ultrasound passes. You may draw a diagram if you wish. There are small bubbles of gas in the body. Explain why these bubbles expand and contract as the ultrasound passes.
5054_s09_qp_2
THEORY
2009
Paper 2, Variant 0
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Questions Discovered
120