Question

B.
State whether the following statements are True or False.
1. Sound is produced by movement of electrons in an electric field.
2. Sound waves can travel through vacuum.
3. Pitch of a sound wave depends on frequency.
4. Frequency of a wave is measured in seconds.
5. Tuba is a wind instrument.
6. A sound between 50 dB and 60 dB is considered to be normal.​

Answer 1

Answer:

1. false  2. false  3. true  4. false  5. true  6. true

Explanation:

1. The sound waves are produced by the to and fro vibration of particles in a particular medium.
2. Sound waves cannot travel through the vacuum as they are mechanical waves, which means, a type of wave which requires a particular medium to propagate.
3. Frequency depends on the pitch of the sound. Pitch is increased to increase the frequency of a sound wave and vice versa.
4. The frequency of a wave is measured in sec⁻¹ since the equation for frequency is f = 1/T, where T is the time period.
5. Tuba is a wind instrument made of brass.
6. A sound between 50 dB and 60 dB is considered to be normal.​ The sound wave of 70 dB and above may damage our ears.