Form 4 Unit 22 Physics: Waves

(not finished)

What are the two types of waves?

Longitudinal and transverse

What are three levels of transparency?

Opaque, translucent, transparent

What are luminous objects?

objects that make their own light

Why can we see light?

Light rays travels from the light source to an object, and then reflects or passes through an object and into our eyes

How do transverse wave travel?

The direction of vibration of fields in the waves is at 90° to the direction that the light travels

How do shadows form(not persona ones)?

when an object blocks light, in which the object is opaque or translucent

What are the two types of shadows(non persona ones)?

Umbra and Penumbra

What is the speed of light in air?

299,702,547m/s

What is an Umbra?

the fully shaded inner region of a shadow cast by an opaque object

What is an penumbra?

a space of partial illumination

What is the ray that is hitting the surface?

Incident ray

What is the ray that is leaving the surface

Reflected ray

What is the dotted line?

Normal

What is the yellow angle?

Angle of incidence

What is the blue angle?

Angle of reflection

What is the surface that the rays are reflecting from?

Plane mirror

What is the relationship between Angle of incidence and Angle of reflection?

i = r

What is the image formed called when looking into a mirror?

Virtual image

What makes refraction occur?

When a ray reaches a substance with a different optical density from a substance it came from

What does the ray do when it reaches a denser substance?

the light slows down going into a denser substance, and the ray bends towards the normal

What does the ray do when it reaches a less dense substance?

the ray speeds up, and the ray bends away from the normal

What is the critical angle?

48.8 degrees

What happens to the ray after it passes the critical angle?

It reflects back inside the medium

What is the name of the ray reflecting back inside the medium?

Total internal reflection

What are the three primary colours in light?

Red, Green, Blue

What happens if a yellow light ray hits a yellow ball?

It gets reflected, making us see the colour yellow

What happens if a red light ray hits a yellow ball?

The light ray gets absorbed by the ball and we cannot see the ball

What is the order of the EM Waves?

Radio waves

Microwaves

Infrared

Visible light

Ultraviolet

X-rays

Gamma rays

What types EMR can penetrate earth’s atmosphere?

Radio, Visable

What is A ?

Peak

What is B?

Amplitude (amp)

What is C?

Wavelength

What is D?

Equilibrium

What is E?

Trough

What is F?

Wavelength

What is the time period?

the time taken for a full cycle of the wave,