(امتحان لايف (16نوفمبر physics || Ch1+Ch2

The curve OPQRS below represents a wave of frequency 50 Hz.

What is the time interval between points O and P.

The ball of simple pendulum pulled aside, then left to move freely. It takes 5 sec to move between the two point X and Y, then the frequency of vibration will be:

 a metallic tube of length 800 m a tuning fork at one end emits sound, at the other end two sound wave are heard between them 2 sec , the velocity of sound through metal (knowing that the velocity of sound through air 340m/s)

The figure shows a wave. Find:
1-Amplitude

The figure shows a wave. Find:

2- The distance AB

The figure shows a wave. Find:

Periodic time

Electromagnetic waves during their propagation in the space are different in

The ratio between the incident angle to the reflecting angle of light is

The normally incident ray on mirror reflects by angle……….

The opposite figure represents two plane mirrors.
xy is an incident ray on the first plane mirror. It will reflect to fall towards the second mirror. Find the angle of reflection on the second plane mirror

Light refracts when it transfers from one medium to another due to difference in

When light transfers from denser medium to less dense one the ratio between the angle of incident to the angle of refraction ……..one

A light ray falls on a glass piece so , it refracts inside it. Which of the following concepts does not change when the light ray refracts?

Knowing that absolute refractive index of benzene is 1.5, and absolute refractive index of flint glass ( 1.65 ), then the relative refractive index between
benzene and flint glass b ng equals:

. When a light ray transmits from a less optical dense medium to another of higher optical density and the angle of incidence = zero, which of the following light properties does not change?

An incident ray falls on the surface of water by an incident angle 60°, a part of the incident ray is reflected and other part is refracted and the reflecting and refracting rays are perpendicular to each other. the refractive index in water.

In the opposite figure: Refractive index of glass.