Advertisements
Advertisements
प्रश्न
State one important property of waves used for echo depth sounding.
Advertisements
उत्तर
The waves used for echo depth sounding are ultrasonic waves (frequency above 20000 Hz). The important property of such type of a wave is that they travel undeviated through long distances and that they can be confined to a narrow beam. They are not easily absorbed in a medium.
APPEARS IN
संबंधित प्रश्न
The lower the frequency of vibration, the higher is the pitch.
Loudness is determined by the __________ of vibration.
The pitch of sound depends on frequency.
A tuning fork produces sound of ................... frequency.
In a piano, pitch is decreased by
Figure shows four waves A, B, C, and D
Name the wave which shows
(a) a note from a musical instrument,
(b) a soft note
(c) a shrill note.
A 0.6 m long stretched wire is made to vibrate in two different modes as shown in figure
(a)
(b)
(i) If the frequency of the note produced in (b) is n, what is the frequency in case (a)?
(ii) In which case (a) or (b), is the note louder? Give reasons.
(iii) In which case is the pitch higher? Give reason.
______ is a general term for the distinguishable characteristic of a wave.
Give scientific reason.
In earlier times, people used to listen for the arrival of a distant train by putting their ear to the rail.
