Question

A sound is played on a flute. A sound of same pitch is played on a trumpet then the frequency and speed of two sound waves respectively at the same place are:
A. Different, different
B. Same, same
C. Different, same
D. Same, different

Answer 1

Hint: Pitch of a sound wave depends on the frequency i.e., pitch increases with the increase in frequency and vice-versa. The speed of sound waves depends on the medium. It is the same for the same medium and different for different mediums.

Complete step by step answer:The pitch is defined as that characteristic of sound by which an acute or shrill note can be distinguished from a grave or flat note. Pitch of a note depends on its wavelength or frequency i.e., when the frequency is higher, pitch is higher and vice-versa. So, when a sound of the same pitch is played on a flute and a trumpet, the frequency of two sound waves produced are the same as the pitch.
The speed of a sound wave depends on the medium through which it travels i.e. it is different in solid, liquid and gas. In this case, the sound waves of both instruments are produced at the same place. Thus, all the environmental conditions i.e., atmospheric pressure, temperature for both the instruments are the same. Hence, the speed of sound waves in both the instruments are the same.

Therefore, option B is correct.

Note:The pitch of a sound is directly proportional to frequency which means with the increase in frequency, pitch increases and with the decrease in frequency, pitch decreases. The speed of a sound depends on the medium through which it passes.