11.6-11.9 Waves 1 Quizlet Cards Flashcards Preview

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Flashcards in 11.6-11.9 Waves 1 Quizlet Cards Deck (27)
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1

What is the difference between mechanical waves and electromagnetic waves?

EM waves don't require a medium.

2

What is an electromagnetic wave?

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

3

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

3x10⁸ms⁻¹

4

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

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

5

Which two regions of the EM spectrum overlap?

X-rays and gamma rays.

6

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

>10⁻¹

7

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

10⁻¹ - 10⁻³

8

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

10⁻³ - 10⁻⁶

9

State the range of wavelengths of visible light

7x10⁻⁷ - 4x10⁻⁷

10

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

10⁻⁷ - 10⁻⁸

11

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

10⁻⁸ - 10⁻¹³

12

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

<10⁻¹⁰

13

Why can't longitudinal waves be polarised?

Longitudinal waves already only have a single driection of oscillation.

14

What is the effect of a polarising filter?

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

15

What is the effect of perpendicular polarising filters

No light is transmitted

16

Give a use of polarising filters.

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

17

What effect does reflection have on the polarisation of light?

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

18

What effect does scattering light have on polarisation?

Scattered light is polarised

19

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

Frequency

20

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

decreases

21

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

increases

22

What is the definition of the refractive index of a material

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

23

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

The normal to the boundary

24

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

Toward the normal

25

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

Away from the normal

26

What is the angle of refraction at the critical angle?

Ninety degrees

27

What are the conditions required for total internal reflection?

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.