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[أحمد سيد جمعة عوض الله]

Definitions units 1,2and 3 (3rd secondary)

Revision questions

Units (one – two and three)

Unit One (Waves)

A. Give the scientific term for each of the following:
1 - The disturbance that's propagating to transfer the energy.
2 - A kind of wave that propagate through space with constant speed (c = 3 x 108 m / s).
4 - A kind of wave that needs a medium to be propagated.
5 - The distance between the position of the body and its origin.
6 - The distance between two points on the path, where the velocity at one is maximum and that at the other.
7 - The maximum displacement of the vibrating body.
8 -The maximum displacement in the positive direction.
9 -The distance between two successive points on the path have the same phase
10 - The time taken to complete on vibration.
11 - The number of complete vibrations made by the vibrating body in one second.
12 - The distance covered by the wave in one second.
13 -The position on the wave where the molecules of the medium come close to each other.
14 -The wave in which the particles of the medium vibrate perpendicularly to the wave propagation.
15 - The line that represents the wave propagation.
16 -The angle between the incident ray and the normal to the surface.
17 - The wave motion in which the vibrating body passes through a fixed point tow successive times the in the same direction.
18 - The unit of frequency when he body makes one vibration in ones second.
19 -The waves that are formed from a vibrated electric and magnetic fields.
20 -The wave motion that can be represented by harmonic functions.
21 -The mechanical wave that occurs when things vibrate.
22 -The repetition of sound due to its reflection.
23 -The change in the direction of wave on in the same medium on bouncing on a surface.
24 -The change in the direction of the wave on traveling between two media differ in density.
25 -The deflection of waves on passing sharp edges or narrow slits.
26 -The superposition of waves that have the same velocity, frequency and direction.
27 -The super position of waves that have the same frequency but opposite in direction.
28 -The position on the wave where the amplitude is maximum.
29 -The position on the wave where the amplitude is vanished.
30 -The interference of waves in which the path difference = (m +.
31- The tone which has the least frequency and the longest wave length.
32 -The tone formed when the string forms four segments.
33 -The distance between two successive nodes on the standing waves.
34 - The distance between the node and the next anti node on the standing wave.
35 - Twice the distance between two successive nodes or two successive antinodes on the standing waves.

36 -The ratio between the speed of light in air to its velocity in the medium.
37 -The ratio between A.R. Index of the second medium to A .R . Index of the first medium.
38 -The ratio between velocities of light in the first medium to its velocity in the second medium.
39 -The ratio between sine angle of incidence of light in the first medium to sine angle of incidence in the second medium.
40 -The product of A. R .index of the 1st medium x sine angle of incidence = A .R . Index of the 2nd medium x sine angle of refraction in that medium.
41 -The light sources that have the same frequency, amplitude and have the same phase.
42 -Bright and dark regions due to interference of light waves that have the same frequency , amplitude and the same phase.
43 -An angle of incidence in the more dense medium which corresponds to an angle of refraction 90 ˚ in the less dense medium.
44 -Phenomenon occurs for light in the denser medium when angle of incidence exceeds the critical angle.
45 -A very fine tubes used to transfer the energy by total internal reflection and they are used in communications and medicine.
46 -A triangular prism that has a base of Angles (45˚. 45˚ and 90˚).
47 -A phenomenon occurs for light in hot regions due to separation of air into layers differ in density.
48 -The angle between the extensions of the incident and the emergent rays in the triangular prism.
49 -The state of deviation when angle of incidence equals angle of emergence in the triangular prism.
50 -Splitting of white light ray into colored spectrum {R.O.Y.G.B.I.V}.
51 -A triangular prism whose vertex has a few degrees.
52 -The angle between the blue spectrum and the red spectrum emerged from the prism.
53 -The refractive index of the prism for the yellow spectrum.
54 -The ratio between the angular size and the mean deviation of the prism.

Unit two (Fluids)

1 -The substance that can flow and has no definite shape.
2 - The substance that has no shape but has a definite volume.
3 - The substance that has neither definite shape nor a definite volume.
4 -The amount of material in the substance.
5 -The amount of space occupied by the substance.
6 - The ratio between mass of the body and its volume at normal temperature.
1. 7 - The ratio between densities of substance to that of water at the same temperature.
2. 8 - The average normal force acting normally per unit area.
3. 9 -The pressure arising from the weight of liquid column acting per unit area.
4. 10 -The pressure arising from the weight of air column acting per unit area.

11- An instrument used to determine the relative density of immiscible liquids.

12 -An instrument used to measure gauge pressure.
13 -An instrument used to measure atmospheric pressure.
14 -An instrument used to amplify the force at constant pressure.
15 - A pressure applied to an enclosed liquid is transmitted undiminished to every portion of the liquid and the walls of the container.
16 -A body wholly or partially immersed in a fluid experiences an up thrust force in the vertical direction equals the weight of the volume of the fluid displaced by the body.
17 -A floating body displaces an amount of fluid equals its weight
18 - The fluid flow in small velocities where the layers slide on each other in smooth and ease
19 - The line indicating the direction of fluid path.
20 - The number of streamlines that crossing perpendicularly per unit area at a point.
21 - The volume of the fluid that flowing through a unit area per unit time.
22 - The mass of the fluid that flowing through a unit area per unit time.
23 - The velocity of fluid flow is inversely proportional with the cross sectional area of the tube.
24 - Property of fluid in which the friction forces resist the sliding of layers on each other.
25 - The tangential force acting on a unit area resulting in unit difference of velocity between two layers separated by unit distance apart.

Unit Three (Heat) .

1 - The continuous random motion of gas molecules in all directions with different velocities when they collide with each other and with the walls of the container.
2 - At constant temperature, the volume of a fixed mass of a gas is inversely proportional to its pressure.
3 - At constant pressure, the volume of a fixed mass of gas is directly proportional to its absolute temperature.
4 - At constant pressure, equal volumes of different gases expand by of its volume at 0 ˚ C per each degree rise in temperature.
5 - At constant volume, pressure of a fixed mass of gas is directly proportional to its absolute temperature.
6 - At constant volume. Equal pressures of different gases increase by of its pressure at 0 ˚ C per each degree rise in temperature.
7 - The increase in volume per unit volume at zero for each rise in temperature 1 degree in temperature.
8- The temperature at which the volume of the gas is vanished theoretically at constant pressure.
9 - The temperature at which the pressure of the gas is vanished theoretically at constant volume.
10 - The atomic mass or molecular mass expresses in grams.
11 - The number of molecules or atoms in one mole gram of any substance.
12 - Equal volumes of different gases contains the same number of molecules under the same conditions.
13 - The average distance covered by the molecule before colliding with another molecule.
14 - The ratio between universal gas constant to Avogadro's number.
15 - The molar heat capacity of gases.
16 - The molecular heat capacity of gases.
17 - The numerical value of molecular masses in unit volume of a gas.
18 - The resultant force affecting a moving body equals the rate of change in change in momentum.
19 - The rate of collision of gas molecules with the container.
20 - The study of the properties of gas in terms of pressure, volume and temperature to deduce the general law of gases.
21 - The study of the large number of gas molecules in their random motion to deduce the kinetic theory of gases.
22 - The measure of average kinetic energy of gas molecules.
23 - The temperature at which the K.E of molecules are vanished
24 - The study of cases at very low temperatures approaching zero Kelvin.
25 - The interactive forces between gas molecules that led to liquefaction or solidification of gases.
26 - The property of liquid gases in which the friction forces and gravity is vanished on gases.
27 - A flask that has double walls of Pyrex used to store liquid gases.
28 - The process in which the temperature of the gas is constant with the surrounding and the acquired energy is converted completely into mechanical work.
29 - The process in which the mechanical work is on the account of the internal energy of the gas.
30 - Property for some metals in which the resistance = zero at very low temperature.
31 - The phenomenon in which the magnetic field inside a super conductor is vanished due to the effect of a permanent magnet.