Vacuum,medium Constructive Destructive In phase Out of phase Obstacle Node (波节) Antinode (波腹)
Nankai University, CY Li
2020/10/14
15
Waves
Physics in English
The stress required to cause actual fracture of a material is called the breaking stress.
Nankai University, CY Li
2020/10/14
7
Physics in English
Hooke’s law: restoring force of an ideal spring
F A
Y
L L0
Y : Young's modulus
F A
S
X L0
S :shear's modulus
P
B
V V0
B : Bulk
modulus
In general, the ratio of the force to the area is called the stress.
Nankai University, CY Li
Examples:
Sound waves in speech. Light waves. Food is cooked in a microwave oven, a kind of
electromagnetic waves. Water waves in sea. Earthquakes,