Question

Two boys Raghav and Ramesh make a toy telephone by joining two Plastic cups through a long string. They both stand apart. Raghav speaks
Softly into 1 cup and Ramesh hears by putting his ear in the other cup .
Now Ramesh speaks and Raghav listens.
(a) What type of waves produced by voice of Raghav and Ramesh in the air inside the plastic cup.
(b) What types of waves are produced in the string?
(c) Give two difference between these type of waves.
(d) What are qualities of both the friends.

Answer 1

Transverse wave is produced by the string. longitudinal wave is formed by the voice of both of them in glass.

Answer 2

Answer:

(a) Raghav and Ramesh's voice creates sound waves in the air in the plastic cups. These sound waves are mechanical waves that need a medium to travel and propagate by compressing and rarefaction of the medium.

(b) The string between the two shells vibrates due to the sound waves generated by Raghav and Ramesh. These vibrations create longitudinal waves in the string, known as mechanical waves.

(c) The two differences between sound waves and waves on a string are:

1. Sound waves need a medium to travel, while waves can propagate on a string through a vacuum.
2. sound waves are longitudinal in nature, while waves on a string may be transverse or longitudinal.

(d) Both Raghav and Ramesh have good communication skills and creativity, having been able to make a toy telephone out of simple materials. They also show curiosity and a willingness to experiment and learn by exploring how the toy phone works.

Learn more about mechanical waves :

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