Sound Physics - Sound

What are damped vibrations?

What are free vibrations?

What adjustments would you make for tuning a stringed instrument for it to emit a note of a desired frequency?

Is pitch same as frequency?

With which of the following frequencies does a tuning fork of frequency 256 Hz resonate? 288 Hz, 314 Hz, 333 Hz, 512 Hz.

Give two examples of forced vibrations.

What is meant by the natural frequency of vibration of a body?

What do you mean by wave motion?

Explain why strings of different thicknesses are provided on a stringed instrument.
[Hint : Natural frequency of vibration of a stretched string is inversely proportional to the radius (or thickness) of string so notes of different frequencies can be produces by vibrating different strings.]

How does the medium affect the amplitude of free vibrations of a body?

Fig. shows three ways in which the string of an instrument can vibrate.

(i) Which of the diagram shows the principle note?
(ii) Which has the frequency four times that of the first?
(iii) What is the ratio of the frequency of the vibration in (a) and (b)?

Explain the phenomenon of resonance giving examples.

Write two differences between transverse and longitudinal waves.

In fig. , P, Q, R and S represent test tubes each of height 20 cm which are filled with water upto heights of 10 cm, 14 cm, 16 cm and 18 cm respectively. If a vibrating tuning fork is placed over the mouth of test tube Q, a loud sound is heard.
(i) Describe the observations with the tubes P, R and S.
(ii) Give the reason for your observation in each case.
(iii) State the principle illustrated by the above experiment.

Name three factors on which the frequency of vibration of a stretched string depends.

Distinguish between music and noise.

Distinguish between longitudinal and transverse waves.

What are characteristics of a wave motion?

Give a simple experiment to demonstrate the reflection of sound waves.

Give the physical explanation for the difference between musical sounds and noises.