Podcast
Questions and Answers
The velocity of a wave is calculated as _______/time
The velocity of a wave is calculated as _______/time
displacement
Electromagnetic waves transfer energy in a _______ direction
Electromagnetic waves transfer energy in a _______ direction
transverse
All types of electromagnetic waves travel at the same velocity through a _______ or air
All types of electromagnetic waves travel at the same velocity through a _______ or air
vacuum
Going from long to short wavelength, the groups in the electromagnetic spectrum are radio, microwave, infrared, visible light, ultraviolet, X-rays, and _______ rays
Going from long to short wavelength, the groups in the electromagnetic spectrum are radio, microwave, infrared, visible light, ultraviolet, X-rays, and _______ rays
Our eyes only detect _______ light
Our eyes only detect _______ light
Red light has the _______ wavelength in the visible spectrum
Red light has the _______ wavelength in the visible spectrum
Gamma rays originate from changes in the _______ of an atom
Gamma rays originate from changes in the _______ of an atom
______ travels in waves.
______ travels in waves.
A wave is a way of transferring ______ or energy.
A wave is a way of transferring ______ or energy.
Energy moves perpendicular to matter in ______ waves.
Energy moves perpendicular to matter in ______ waves.
Longitudinal waves show areas of ______ and rarefaction.
Longitudinal waves show areas of ______ and rarefaction.
The unit of frequency is ______ (Hz).
The unit of frequency is ______ (Hz).
Humans can hear a range of 20-20000 ______.
Humans can hear a range of 20-20000 ______.
The amplitude of the wave is the maximum distance of a point on the wave from its ______ position.
The amplitude of the wave is the maximum distance of a point on the wave from its ______ position.
Translucent objects allow ___ to pass through
Translucent objects allow ___ to pass through
Opaque objects do not transmit ___
Opaque objects do not transmit ___
A lens forms an image by ___ light
A lens forms an image by ___ light
The distance from the lens to the principal focus is called the ___
The distance from the lens to the principal focus is called the ___
Ray diagrams are used to show the formation of images by convex and ___ lenses
Ray diagrams are used to show the formation of images by convex and ___ lenses
Colour filters work by absorbing certain ___ and transmitting other wavelengths
Colour filters work by absorbing certain ___ and transmitting other wavelengths
The observed red-shift provides evidence that space itself (the universe) is ___
The observed red-shift provides evidence that space itself (the universe) is ___
An infrared thermometer can be used to measure emission of ______ radiation
An infrared thermometer can be used to measure emission of ______ radiation
White, silver, shiny surfaces are poor absorbers/ emitters of ______ radiation as they reflect all visible light wavelengths
White, silver, shiny surfaces are poor absorbers/ emitters of ______ radiation as they reflect all visible light wavelengths
Radiators are often painted white to release ______ radiation steadily
Radiators are often painted white to release ______ radiation steadily
Dark, matte surfaces are good emitters of ______ radiation
Dark, matte surfaces are good emitters of ______ radiation
A Leslie cube can be used to investigate emission of ______ radiation
A Leslie cube can be used to investigate emission of ______ radiation
All bodies (objects), no matter what temperature, emit and absorb ______ radiation
All bodies (objects), no matter what temperature, emit and absorb ______ radiation
A perfect black body is a theoretical object that absorbs all of the radiation incident on it and does not reflect or transmit any ______
A perfect black body is a theoretical object that absorbs all of the radiation incident on it and does not reflect or transmit any ______
Stars are considered to be black bodies because they are good emitters (and therefore absorbers) of most wavelengths in the EM ______
Stars are considered to be black bodies because they are good emitters (and therefore absorbers) of most wavelengths in the EM ______
The temperature of the Earth depends on many factors including: the rates of absorption and emission of ______, reflection of radiation into space, and the concentration of greenhouse gases in its atmosphere
The temperature of the Earth depends on many factors including: the rates of absorption and emission of ______, reflection of radiation into space, and the concentration of greenhouse gases in its atmosphere
