Physics Test

Question 1

describe that energy is transferred using waves?

Answer 1

Waves move energy from one place to another without moving matter.

Question 2

define transverse waves

Answer 2

verticals vibrate at right perpandicular to the direction of energy transfer

e.g water waves or light

Question 3

define longitudinal waves

Answer 3

Particles vibrate parallel to the energy’s path, forming compressions and rarefactions, and need a medium to travel.

e.g sound waves

Question 4

define amplitude

Answer 4

the maximum disturbance from the waves undisturbed position and affects soundness

Question 5

define wavelength

Answer 5

the distance along one full wave cycle the distance between the same point on two same waves

Question 6

define frequency

Answer 6

the number of complete waves that pass a point every second in hz

Question 7

define period

Answer 7

the time it takes for one complete wave to pass through a given point in s

Question 8

define hz

Answer 8

the standard unit for frequency

Question 9

identify the different parts of the eletromagnetic spectrum

Answer 9

in order from longest wavelength/lowest frequency to shortest wavelength/highest frequency

radio waves, microwaves, infrared, visible light , ultraviolet uv light, gamma rays

Question 10

relate wavelength to the type of electromagnetic radiation and how this wavelength changes from one end tot the em spectrum to the other?

Answer 10

Electromagnetic waves differ by wavelength and frequency—radio waves have long wavelengths and low frequency, gamma rays have short wavelengths and high frequency.

Question 11

define light as a transverse wave?

Answer 11

Light is energy and part of the electromagnetic spectrum. It’s a transverse wave, meaning it moves up and down while energy moves forward, and it travels in straight lines called rays.

Question 12

define radio waves

Answer 12

used for communication
e.g radio and tv broadcasts

Question 13

define inferred

Answer 13

used in night vision technology
e.g heaters, thermal cameras

Question 14

define uv light

Answer 14

kills bacteria and can lead to potentially skin cancer

Question 15

define gamma rays

Answer 15

used in medical treatments can damage DNA and cells

Question 16

define luminous

Answer 16

produce their own light

Question 17

describe how objects are observed in a plane mirror

Answer 17

light travels from the object to our eyes the rays bounce off the mirror following law of reflection from a smooth surface called specular reflection

Question 18

define regular reflection

Answer 18

light rays reflect off smooth surfaces like mirrors at the same angle

Question 19

define diffuse reflection

Answer 19

a rough surface causes light rays to reflect in different directions preventing a clear image

Question 20

describe the relationship between the angle of incidence, normal and angle of reflection

Answer 20

The angle of incidence and the angle of reflection are always the same. Both are measured from a line called the normal, which is at a right angle to the surface.

Question 21

calculate the angle of reflection from the angle of incidence in a plane mirror using law of reflection

Answer 21

e.g if the angle of incidence is 45 degrees the angle of reflection is also 45. I = r (I=angle of incidence, r= angle of reflection).

Question 22

list the the parts of the electromagnetic spectrum in order longest wavelength/ lowest frequency to shortest wavelength/ highest frequency?

Answer 22

1. Radio waves
2. Microwaves
3. Infrared
4. Visible light
5. UV light (ultra violet)
6. X-rays
7. Gamma Rays

Question 23

angle of refraction definition

refracted ray

Answer 23

the angle between the refracted ray and the normal within the new medium (e.g. water)

light ray within the second medium

Question 24

angle of reflection

reflected ray

Answer 24

angle between the reflected ray and the normal

ray that bounces off surface

Question 25

when light goes from less dense medium to more dense medium what happens to the refracted ray?

Answer 25

It slows down and bends towards the normal.

Question 26

What is a vacuum

Answer 26

An area with no particles

Question 27

Why can't sound travel through space

Answer 27

Sound requires a medium to propagate, in space there is no particles for sound vibrations to travel through.