According to the Law of reflection, a light ray striking a mirror: 1- continues moving through the mirror in the same direction. 2- bounces off the mirror at the same angle it hits
2- bounces off the mirror at the same angle it hits
20
A(n) ……………………………………….wave is called a seismic wave. A. water. B. sound. C. earthquake.
C. earthquake.
25
Seismic waves can be…………………………… . A. transverse B. longitudinal C. a combination of longitudinal and transverse
a combination of longitudinal and transverse
15
………….is the number of waves passing through a point un one second. A. amplitude. B. wavelength C. frequency
C. frequency
20
Which term describes changing direction of a wave when it passes through two different transparent media? A. Refraction. B. Reflection. C. Diffraction.
Refraction.
15
When a plastic ruler attracts tiny pieces of paper after rubbing it to your hair, this is an example of________________ a- current electricity b- static electricity
b- static electricity
25
20- The accumulation of excess electric charge (positive or negative) on an object is called A- Static electricity B- Electric discharge C- Resistance
A- Static electricity
15
Which device uses direct current?
Torch light
25
Which graph represents Alternating current? Explain your answer