Sound - Class 9

Which of these are NOT the properties of a sound wave?

• Wavelength

• Speed

• Distance

• Amplitude

What are high pressure and low pressure regions during transmission of sound called?

• Compressions: high pressure

• Valleys: low pressure

• Rarefractions: low pressure

• Dip: low pressure

Is sound wave

• longitudinal

• transverse

How is intensity related to amplitude?

Which of these represents wavelength?

Which of these is correct?

What is(are) the correct match with the SI unit?

• Frequency: 1/sec

• Frequency : Hertz

• Wavelength: metre

• Time period: 1/Hertz

Represent higher frequency on this graph, without changing any other features.

Mark amplitude, wavelength, time period using this figure.

What happens when frequency increases? (given everything else is constant)

• Time period increases

• Pitch increases

• Time period decreases

• speed increases

• Amplitude increases