Pitch vs Loudness

Q.

Write the list of pleasant and unpleasant sound.

Q. The image shows two sound waves a and b. Select the correct statements given below regarding the two waves.

1. Wave 'a' has higher pitch than that of wave 'b'.
2. Wave 'b' has higher pitch than that of wave 'a'.
3. Wave 'a' has higher frequency than that of wave 'b'.
4. Wave 'b' has higher frequency than that of wave 'a'.

Q.

The pitch of the sound made by a guitar string can be lowered by replacing the string with a thicker string.

1. True
2. False

Q. Which of the following time periods of a sound wave would result in the highest pitch?

1. $0.2\text{s}$
2. $0.02\text{s}$
3. $0.1\text{s}$
4. $1\text{s}$

Q.

If a sound travels from air to water then which quantity will remain unchanged? a) velocity b) wavelength c) frequency d) amplitude

Q.

Two sound waves, named A and B, are travelling in air. If wave A has a time period of 2 seconds and an amplitude of 3 cms and wave B has a time period of 3 seconds and an amplitude of 11 cms, then which of the following statements are correct?

1. 10 Hz

2. 20 Hz

3. 40 Hz

4. 200 Hz

Q.

If the strings of a violin are made thicker, its pitch__________.

Q. Question 6
Loudness of sound is measured in units of

(a) Decibel (dB)
(b) Hertz (Hz)
(c) Metre (m)
(d) Metre/second (m/s)

Q.

Differentiate between loudness and pitch.

Q. In a normal conversation, the loudness of sound is________.

1. 55 dB
2. 60 dB
3. 70 dB
4. 65 dB

Q.

Two sound waves, named A and B, are travelling in air. If, wave A has a time period of 2 seconds and an amplitude of 3 cms and wave B has a time period of 3 seconds and an amplitude of 11 cms, then which of the following statements are correct?

1. 10 Hz

2. 20 Hz

3. 40 Hz

4. 200 Hz

Q.

Two sound waves, named A and B, are travelling in air. If, wave A has a time period of 2 seconds and an amplitude of 3 cms and wave B has a time period of 3 seconds and an amplitude of 11 cms, then which of the following statements are correct?

1. Wave A is louder than wave B

2. Wave B has a lower pitch than wave A

3. Wave A has a lower pitch than wave B

4. Wave B is louder than wave A

Q. Sound produced by two instruments have different frequencies but the same amplitude. Choose the correct statement.

1. Their loudness will be same but pitch will be different.
2. Their pitch will be same but loudness will be different.
3. Both loudness and pitch will be different for the two sounds.
4. Both loudness and pitch will be same for the two sounds.

Q. The waveforms of two sound waves A and B are shown below. Choose the correct statement.

1. Both are equally loud.
2. A is shriller than B.
3. Both are equally shrill.
4. A is louder than B.

Q. Loudness of the sound is measured in ________.

1. decibel
2. metre
3. pascal
4. hertz

Q. Which of the following measures would help in controlling noise pollution in the residential areas?

1. Setting up industries away from residential areas
2. Maintenance of old vehicles and machines
3. Restriction on unnecessary honking
4. Cutting down trees

Q. The shrillness of a sound is called as ___.

1. amplitude
2. frequency
3. loudness
4. pitch

Q. Loudness of sound is proportional to ____________ .

1. its amplitude
2. its frequency
3. square of its amplitude
4. square of its frequency

Q. How can the pitch of sound produced in a piano be changed?

Q. A guitar has strings of different to produce sounds of different .

1. thickness
2. material
3. pitch
4. loudness

Q. Which of the following is NOT a source of noise pollution ?

1. Machines
2. Soothing music
3. Honking
4. Loud speakers

Q. Match the following sounds with their suitable decibels.

1. $140dB$
2. $10dB$
3. $70dB$
4. $30dB$

Q. A sound signal of $128$ vibrations per second has a wavelength of $2.7m.$ Calculate the speed with which the wave travels.