Waves

Question 1

Wave transferral of energy

Answer 1

Waves transfer energy from one point to another using vibrations

Question 2

Transverse vs longitudinal waves

Answer 2

Transverse waves move perpendicular to the direction of wave travel, examples include water and electromagnetic waves

Longitudinal waves move parallel to the direction of wave travel, examples sound and ultrasound waves

Question 3

Frequency

Answer 3

The complete number of oscillations generated per second and is represented by f

Question 4

Wave length

Answer 4

The distance between successive particles which are at the same point in their paths at the same time and are moving in the same direction

Question 5

Amplitude

Answer 5

The maximum displacement of particles in the wave train from their rest positions

Question 6

Velocity equation

Answer 6

V = F x Lambda (wavelength)

V is in m/s, frequency is in Hz, wavelength is in m

Question 7

Applications of echoes

Question 8

Ultrasound meaning & uses

Answer 8

Sound waves above 20,000 Hz

Used in medicine to measure foetal head diameter and in industry to detect defects in metals

Question 9

Sonar vs radar

Answer 9

Sonar uses sound pulses to detect objects underwater

Radar uses electromagnetic waves to detect aircrafts and ships

Question 10

Electromagnetic spectrum

Answer 10

Radio waves
Microwaves
Infrared
Visible light
Ultra violet
X-rays
Gamma rays

Question 11

Results of exposure to electromagnetic spectrum

Answer 11

Microwaves cause internal heating of body tissues

Infrared radiation is felt as heat and can cause skin burns

Certain