[3 Mark Question Answer]

Question 13 Marks

Name three characteristics of a musical sound.

Answer

Sounds can be distinguished from one another by the following three different characteristics:
$i.$ loudness
$ii.$ pitch or shrillness, and
$iii.$ quality or timbre

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Question 23 Marks

Figure shows four waves $A, B, C,$ and $D$

Name the wave which shows
$(a)$ a note from a musical instrument,
$(b)$ a soft note
$(c)$ a shrill note.

Answer

$(a)$ a note from a musical sound is shown by $(D)$

$(b)$ a soft note is shown by $(A)$

$(c)$ a shrill note is shown by $(C)$

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Question 33 Marks

Two identical guitars are played by two persons to give notes of the same pitch. Will they differ in quantity? Give reason for your answer.

Answer

No, those sound will not differ because this sound is produced by the same material at the same note so the quality will remain the same, without any acoustic changes you will not be able to differentiate between these. But when two-person talk they might be speaking at the same note or pitch but you can differ between those by the timber of voice. Quality gets changed.

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Question 43 Marks

Draw a diagram to show the wave pattern of high pitch note and a low pitch note, but of the same loudness.

Answer

PATTERN OF LOW PITCH AND HIGH PITCH NOTE :
LOW PITCH NOTE:

HIGH PITCH NOTE:

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Question 53 Marks

Name and define the characteristic which enables one to distinguish two sounds of same loudness, but of different frequencies, given by the same instrument.

Answer

Sounds of different frequencies but of same loudness and timbre can be distinguished by the property called 'pitch' of sound.
The sensation of a frequency is commonly referred to as the pitch of a sound. A high pitch sound corresponds to a high$-$frequency sound wave and a low pitch sound corresponds to a low$-$frequency sound wave.

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Question 63 Marks

State three factors on which loudness of sound heard by a listener depends.

Answer

THREE FACTOR FOR LOUDNESS OF SOUND :
$i.$ Surface area of the sounding body. i.e. is directly proportional to the surface area of vibrating body.
$ii.$ On the distance of the source of sound, i.e. decreases with distance.
$iii.$ On amplitude of wave i.e. increases with amplitude.

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Question 73 Marks

How does the wave pattern of a loud note differ from a soft note ? Draw a diagram

Answer

Amplitude is the size of the vibration, and this determines how loud the sound is. A larger amplitude means a louder sound, and a smaller amplitude means a softer sound. Below is the diagram which represents the soft and loud waves respectively. First one is a softer wave and the second one is a louder wave.

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Question 83 Marks

Two waves of the same pitch have amplitudes in the ratio $1: 3$ What will be the ratio of their $(i)$ loudness, $(ii)$ pitch?

Answer

$(i)$ Loudness $∝ ($amplitude$)^2$
Loudness is proportional to amplitude square Ratio of loudness
$\frac{ L _1}{ L _2}=\frac{\left(a_1\right)^2}{\left(a_2\right)^2}=\frac{(1)^2}{(3)^2}=\frac{1}{9}=1: 9$
$(ii)$ Frequency of the sound wave has no effect on amplitude.
so, frequency remains the same if the pitch is unchanged.
$\therefore \frac{\text { Pitch of first wave }}{\text { Pitch of second wave }}=\frac{1}{1}=1: 1$.

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