Semestre 4 ENERO-FEB 2016

Question 1

Wave

Answer 1

Movement of energy from one place to another (disturbance or vibration).

Question 2

Standing wave

Answer 2

Interference pattern produced by two waves of equal amplitude and frequency traveling in opposite directions.

Question 3

Types of wave

Answer 3

+Longitudinal: wave in which vibrations of the medium are parallel to the direction the wave is moving
+Transverse: wave in which the vibration of the medium are perpendicular to the wave is moving.

Question 4

Parts of a wave:

Answer 4

Amplitude, crest, trough, wavelength.

Question 5

Amplitude

Answer 5

Maximum distance from the equilibrium position that occurs in periodic motion.

Question 6

Crest

Answer 6

Peak of a wave disturbance / highest point of the wave.

Question 7

Trough

Answer 7

A valley of a wave disturbance / lowest point of the wave.

Question 8

Wavelength

Answer 8

Distance from one crest to another / through to trough.

Question 9

Restoring force

Answer 9

Is proportional to the distance the mass is from the equilibrium point.

Question 10

Equilibrium position

Answer 10

Position were net force is zero.

Question 11

Frequency

Answer 11

Number of times a periodic motion repeats in a unit of time (1/period = Hertz).

Question 12

Vibration

Answer 12

Back and forth of motion

Question 13

Cycle

Answer 13

One complete repetition of a periodic motion, begins at any position and lasts until the mass returns to the original position. It moves in the same direction.

Question 14

Period

Answer 14

Time to complete a cycle: (1/frequency [seconds])

Question 15

Spring constant

Answer 15

Amount of force required to stretch a spring by one unit of length.

Question 16

Pendulum

Answer 16

System that oscillates, the period depends on the length.

Question 17

Clocks

Answer 17

Keeping time > process of counting the number of repetitions of a regular process.

Question 18

Velocity

Answer 18

f x ƛ [=] meters over seconds

Question 19

V sound

Answer 19

340 m/s

Question 20

V light

Answer 20

3x10⁸ km/s

Question 21

Period of a spring [seconds]

Answer 21

2 π √m/k (mass/constant [newtons/meters]

Question 22

Period of a pendulum

Answer 22

2 π √l/g (length/gravity [9.81]2

Question 23

Diffraction

Answer 23

Occurs when an object changes the direction of a wave and it bends. The amount depends on the wavelength, size and the opening.

Question 24

Reflection

Answer 24

When a wave strikes an object and its bounces off.
LAW: the angle of the incident wave is equal to the one of reflection.
Ex. sound produces echoes

Question 25

Refraction

Answer 25

Bending of a wave cause by the change of speed as it move from one medium to another.

Question 26

Interference

Answer 26

2 or more waves overlap and combine to form a new wave: constructive (new bigger wave), destructive (new reduced wave or canceled wave).

Question 27

Formula (triángulo)

Answer 27

v

F*ƛ

Question 28

Wave-speed

Answer 28

wavelength x frequency