Question Text
Question 2 :
Which of the following frequency of sound can't be heard by human beings?
Question 4 :
B<span>ats detect the obstacle in their path by receiving the detected:</span>
Question 6 :
The waves in which the particles of the medium travel in the same direction as the waves are called :
Question 7 :
In a longitudinal wave, the density of particles is more at a compression.<br>
Question 8 :
In echo cardiography (ECG) the frequency of the sound waves used is
Question 11 :
For audible sound, the time interval between two words should be :
Question 13 :
Assertion: In a progressive longitudinal wave, the amplitude of the wave will not be the same at all points of the medium along the direction of motion of the wave.
Reason: There is a continuous change of the phase angle of the wave as it progresses in the direction of motion.
Question 16 :
The maximum speed of vibrations which produce audible sound will be in:
Question 17 :
Assertion: Compression and rarefaction involve changes in density and pressure.
Reason: When particles are compressed, the density of medium increases, and when they are rarefied, the density of medium decreases.
Question 18 :
Which of the following sound of given frequencies can be heard by us?
