4.2- MEASURING WAVES

Question 1

When a phone call is made what is the sound wave converted to?

Answer 1

electrical waves

Question 2

When an intercontinental phone call is made, what are the waves carried by and from where?

Answer 2

electromagnetic waves from ground transmitters to satellites in space + back to ground receivers, where they’re converted back to electrical waves then back to sound waves

Question 3

What do electronic circuits ensure with intercontinental waves?

Answer 3

ensure sound waves are very similar to original sound waves

Question 4

What do engineers who design + maintain communications systems need to measure?

Answer 4

different types of waves at different stages, to make sure waves not distorted

Question 5

Definition of the displacement of a vibrating particle?

Answer 5

distance and direction from its equilibrium position

Question 6

Definition of amplitude of wave?

Answer 6

maximum displacement of vibrating particle

Question 7

What is the amplitude for a transverse wave?

Answer 7

height of a wave crest or depth of wave trough from its equilibrium position

Question 8

Definition of wavelength of wave?

Answer 8

least distance between two adjacent vibrating particles with same displacement + velocity at same time

Question 9

Definition of one complete cycle of a wave?

Answer 9

from maximum displacement to next maximum displacement

Question 10

Definition of period of a wave?

Answer 10

time for one complete wave to pass a fixed point

Question 11

Definition of frequency of a wave?

Answer 11

number of cycles of vibrations of a particle per second, or the number of complete waves passing point per second

Question 12

What is the unit of frequency?

Answer 12

hertz (Hz)

Question 13

How is the period of a wave calculated using frequency?

Answer 13

1/f

Question 14

What happens to wavelength if frequency is increased?

Answer 14

wavelength becomes shorter

Question 15

How is wave speed calculated?

Answer 15

c= fλ

Question 16

What is the phase of a vibrating particle at a certain time?

Answer 16

fraction of a cycle it has completed since the start of the cycle

Question 17

What is the phase difference between two particles vibrating at the same frequency?

Answer 17

fraction of a cycle between the vibrations of the two particles

Question 18

What is the phase difference measured in?

Answer 18

degrees or radians, where 1 cycle = 360° = 2π radians

Question 19

How is phase difference measured in radians?

Answer 19

λ

d- distance apart
λ- wavelength