امتحان لايف Phy(8 Feb) || Revision ch1

In the opposite figure the pendulum makes a complete oscillation when…….

If the taken by the vibrating object to make one complete vibration is 0.1 sec so the number of complete vibrations in 100 sec is . . .

The ratio between the periodic time and the frequency of a vibrating body equals 1/625  S2, so the number of oscillations made by the body during 25 s is………..oscillations.

A simple pendulum started a simple harmonic motion from the farthest position away from its equilibrium position at t = 0. If the pendulum is T, which of the following graphs represents its motion? ………….

The opposite figure represents the relation between the vertical displacement (d) of one of the medium particles and the time (t) for a transverse wave: if the frequency of the wave equals 50 Hz, the time interval between the two points (a) and (b) is…….S

The time between the passage of the 1st crest and 10th crest on a certain point in the path of motion is 0.2 sec so the frequency of source is………..

Two sound waves of 300hz,600hz propagate in air

The ratio between their velocities is………..

Two sound waves of 300hz,600hz propagate in air

The ratio between their wavelength is

Six sea waves pass per minute by a person standing at the end of a cliff in the sea, he noticed that each 5 waves occupy a distance of 75 metre.

the velocity of the wave

Two tuning forks of frequency 550 & 900 Hz are used in sound’s experiment, the difference between their wavelengths was 23 cm. Calculate the velocity of sound in air………… m/s

The opposite figure shows a wave at different times where A represent the wave at a certain moment but B represent the same wave after 2 sec.

1-frequency………hz

The opposite figure shows a wave at different times where A represent the wave at a certain moment but B represent the same wave after 2 sec.

2-wave velocity……m/s

In one medium a wave has a frequency f1 wavelength λ1 and speed c1 the wave passes from this medium into another, where is speed is2/3  c1 . In the second medium the :

If a light ray travelled from a medium of refractive index n1 to another medium of refractive index n2 where n2 > n1, the graphical representation of the relation between sin ϕ  and sin⁡θ  , when they are drawn with the same scale, would  be ………………………

Blue light ray of wavelength 420 nm in air fell on the surface of water. If the refractive index of water is 4/3  , the wavelength of the blue light in water equals………

The opposite figure shows a light ray falling From medium 1 on the boundary surface with  Medium 2, so the relative refractive index from  Medium 1 to medium 2 equals…..

If n glass) > n water) > n benzene, then the critical angle in glass relative to the benzene is……….The critical angle in water relative to benzene.

A fish looking from within water of refractive index 4/3 sees the outside world through a circular horizon. If the fish √7  cm below the surface of water, what will be the radius of the circular horizon………

If light travels a distance X in t seconds in air and 2X in 3 t seconds in a medium, the critical angle of the medium is…….

A light ray coming from a source under water surface may not be seen in the air due to

In the opposite figure two light rays intersect At a point on a vertical screen. If a glass plate Is put in front of the screen in the path of the Two rays,