Skip to content 1 For the sound wave represented by the graph shown in Fig.
SA (Short)
2 Table shows the speed of sound in a few media at atmospheric pressure.
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3 An experiment is being set up that requires echoes to arrive at least 0.2 s after the emission of sound. What minimum distance should a reflecting surface be placed at? Assume the…
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4 Two friends are standing along a steel fence at a distance of 340 m from each other as shown in fig.
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5 Which observation best supports the idea that sound is a mechanical wave?
MCQ (Multiple Choice)
6 Sound travels much farther in water than light, and thus, is used for various underwater applications.
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7 For a sound wave propagating in a medium, increasing its frequency will increase its:
MCQ (Multiple Choice)
8 If 20 compressions pass a point in 4 seconds, the frequency is:
MCQ (Multiple Choice)
9 In a room, the reflected sound reaches the ear 0.05 s after its production. Will it produce an echo or reverberation? Justify your answer.
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10 The sound waves emitted by three sources A, B and C are represented in the given figure.
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11 Graphs representing two sound waves are shown in the given figure.
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12 Draw a graph to represent a sound wave for which the density amplitude is 3 units and wavelength is 4 cm.
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13 A source produces a sound wave of wavelength 3.44 m. If the wave travels with a speed of 344 ms⁻¹ find its time period.
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14 In a movie, while showing the explosion of a spacecraft in space, a flash of light is shown along with sound at the same time.
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15 A ship searching for a sunken ship sent a sonar signal and detected an echo after 5 s.
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16 A vehicle is fitted with an ultrasonic distance sensor as part of parking assistance system which provides echolocation, while the driver is reversing the vehicle.
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17 The speed of sound in air is about 331 ms⁻¹ at 0 °C and nearly 344 ms⁻¹ at 22 °C.
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18 The graphical representation of two sound waves A and B propagating at the same speed of 345 ms⁻¹ is shown in the given figure.
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19 The variation of density of medium for a sound wave propagating with a speed of 340 ms⁻¹ is shown in the given figure.
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20 Two identical sound sources are placed at A and B, one in air and one submerged in water as shown in the given figure.
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21 How do most bats use sound to locate their prey in the dark at night?
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22 Two astronauts are repairing the arm of a space station together during a spacewalk.
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23 Explore various ways of producing sound.
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24 Make a list of different types of musical instruments and identify their vibrating parts which produce sound.
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25 Assertion (A): We cannot hear the sound of a bell ringing in a closed jar after most of the air is pumped out.
AR (Assertion & Reason)
26 Assertion (A): Compressions and rarefactions move through the medium.
AR (Assertion & Reason)
27 The variation of density of the medium for two sound waves is shown in Fig.
SA (Short)
28 When sound travels from a tuning fork to your ear, which of the following actually reaches your ear?
MCQ (Multiple Choice)
29 Conduct Activity 10.1 once again with a thick rubber band and then with a thin rubber band. Does the thin rubber band vibrate faster than the thick rubber band? If yes, how do the…
SA (Short)
30 If the frequency of a sound wave produced by an oscillating piston of a long tube filled with air is 20 Hz, then how many oscillations does the piston complete per minute?
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