Waves Flashcards
in a sound wave, a displacement node is a pressure antinode and vice versa
A node (N) is a point where the amplitude of vibration is the minimum and pressure is the maximum. An antinode (A) is a point where the amplitude of vibration is the maximum and pressure is the minimum. Therefore, a displacement node is nothing but a pressure antinode, and vice versa.
bats can ascertain distances, directions, nature, and sizes of the obstacles
without any “eyes”
Bats emit ultrasonic waves and when these waves strike the obstacles and get reflected back to the bats they ascertain distances, directions, nature, and sizes of the obstacles without any “eyes”.
a violin note and sitar note may have the same frequency, yet we can
distinguish between the two notes,
A violin note and sitar note may have the same frequency, yet we can distinguish between the two notes, Because they emit different harmonies which can be easily differentiated by human ears.
solids can support both longitudinal and transverse waves, but only
longitudinal waves can propagate in gases, and
Transverse waves produce shear, but because gases lack shear modulus and are unable to sustain shear, they can only propagate longitudinal waves. Solids can propagate both transverse and longitudinal waves and have both shear and bulk modulus of elasticity.
the shape of a pulse gets distorted during propagation in a dispersive medium.
The shape of pulse gets distorted during propagation in dispersive medium because it is a combination of waves with different wavelengths. During propagation, waves with different wavelength moves with different velocities which results in distortion of pulse.
