11.6-11.9 Waves 1 Quizlet Cards Flashcards Preview

Physics > 11.6-11.9 Waves 1 Quizlet Cards > Flashcards

Flashcards in 11.6-11.9 Waves 1 Quizlet Cards Deck (27)
Loading flashcards...
1
Q

What is the difference between mechanical waves and electromagnetic waves?

A

EM waves don’t require a medium.

2
Q

What is an electromagnetic wave?

A

An oscillation of the electric and magentic fields at right angles to each other.

3
Q

What is the speed of all EM waves in a vacuum/air?

A

3x10⁸ms⁻¹

4
Q

List the regions of the EM spectrum in order of increasing wavelength.

A

Radio waves, Microwaves, Infrared, Visible Light, Ultraviolet, X-rays, Gamma rays

5
Q

Which two regions of the EM spectrum overlap?

A

X-rays and gamma rays.

6
Q

State the range of wavelengths (in powers of 10) of radio waves

A

> 10⁻¹

7
Q

State the range of wavelengths (in powers of 10) of microwaves

A

10⁻¹ - 10⁻³

8
Q

State the range of wavelengths (in powers of 10) of infrared

A

10⁻³ - 10⁻⁶

9
Q

State the range of wavelengths of visible light

A

7x10⁻⁷ - 4x10⁻⁷

10
Q

State the range of wavelengths (in powers of 10) of ultraviolet

A

10⁻⁷ - 10⁻⁸

11
Q

State the range of wavelengths (in powers of 10) of X-rays

A

10⁻⁸ - 10⁻¹³

12
Q

State the range of wavelengths (in powers of 10) of gamma rays

A

<10⁻¹⁰

13
Q

Why can’t longitudinal waves be polarised?

A

Longitudinal waves already only have a single driection of oscillation.

14
Q

What is the effect of a polarising filter?

A

It only transmits the component of the oscillations parallel to the filter

15
Q

What is the effect of perpendicular polarising filters

A

No light is transmitted

16
Q

Give a use of polarising filters.

A

LCD screens, 3D TV, polarimetry in manufacturing, anti-glare sunglasses

17
Q

What effect does reflection have on the polarisation of light?

A

Reflected light is partially polarised in the plane of the surface.

18
Q

What effect does scattering light have on polarisation?

A

Scattered light is polarised

19
Q

Which wave property always remains constant when a wave travels from one medium to another?

A

Frequency

20
Q

When entering a material with a higher refractive index what happens to wave speed?

A

decreases

21
Q

When entering a material with a lower refractive index what happens to wavelength?

A

increases

22
Q

What is the definition of the refractive index of a material

A

Speed of light in a vacuum/Speed of light in material

23
Q

What are the angles of incidence and refraction measured relative to?

A

The normal to the boundary

24
Q

Which way do waves refract when entering a material with a higher refractive index?

A

Toward the normal

25
Q

Which way do waves refract when entering a material with a lower refractive index?

A

Away from the normal

26
Q

What is the angle of refraction at the critical angle?

A

Ninety degrees

27
Q

What are the conditions required for total internal reflection?

A

Wave must be travelling in a material with a higher index and meeting a boundary with a material of lower refractive index. The angle of incidence must be greater than the critical angle.