science

52問 • 2年前

問題一覧

are waves that are created as a result of vibrations between an electric field and a magnetic field that moves through space at the speed of light.

em waves

are similar in that they all move at the speed of light and consist of moving electric and magnetic fields.

em waves

All of them exhibit the same characteristic of not requiring any medium to propagate the energy.

em waves

parts of em waves

crest, trough, wavelength, frequency

highest point of the wave.

crest

lowest point of the wave.

trough

distance between crest to crest or trough to trough.

wavelength

the number of waves that pass a fixed point in a given amount of time

frequency

are perpendicular to the direction in which the waves move.

oscillating electric and magnetic field

transverse waves

em waves

em spectrum based on

frequency, wavelength, photon energy

The behavior of an electromagnetic wave in a substance depends on its

frequency, wavelength

These oscillations may occurvat very low frequency or at an extremely high frequency and the entire range of frequencies is referred to as

em spectrum

are used for communication such as television and radio.

radio waves

They do not cause damage if absorbed by the human body, and they can be reflected to change their direction.

radio waves

These properties make them ideal for communications.

radio waves

are used for cooking food and for satellite communications.

microwaves

have frequencies which are easily absorbed by molecules in food.

high frequency microwaves

pass easily through the atmosphere, so they can pass between stations on Earth and satellites in orbit.

microwaves

is used by electrical heaters, cookers for cooking food, and by infrared cameras which detect people in the dark.

infrared

has frequencies which are absorbed by some chemical bonds.

infrared

useful for electrical heaters and for cooking food.

infrared

All objects emit

infrared light

is useful for detecting people in the dark.

termal imaging

is the light we can see.

visible light

It is used in fiber optic communications, where coded pulses of light travel through glass fibres from a source to a receiver.

visible light

can kill bacteria that are present in water

ultraviolet

this sterilizes the water and makes it safe to drink.

ultraviolet

is also good for the skin as it helps to make vitamin D.

ultraviolet

are ionizing electromagnetic radiation

gamma rays

obtained by the decay of an atomic nucleus.

gamma rays

are more penetrating, in matter, and can damage living cells to a great extent.

gamma rays

are used in medicine (radiotherapy), industry (sterilization and disinfection) and the nuclear industry.

gamma rays

can be described in terms of a stream of particles contain a particle of energy called photons.

em radiation

a particle of energy

photons

the process of emitting energy

radiation

particles, waves

such as high energy of protons, neutrons, electrons, atoms, and ions;

particles

either light or sound.

waves

natural/background radiation, man-made radiation

These are composed of unstable atoms that give off their excess energy until it becomes stable.

radioactive materials

This happens during the spontaneous change to be more stable.

radioactive decay

One way to describe radioactivity of an element is its

half-life

which is the time it takes for half of the atoms of a radioactive substance to decay.

half-life

can range from less than a millionth of a second to millions of years.

half-life

The standard unit of measurement of exposure to ionizing radiation.

sievert (Sv)

This measure the amount of radiation and in 1 Sv is 100x larger than 1 rem.

rem (roentgen equivalent man)

It is often useful to express the rate at which dose is delivered.

rem (roentgen equivalent man)

Radiation affects us in two ways:

stochastic effects, non-stochastic effects

associated with long term, low level exposure to radiation;

stochastic effects

appear in cases of exposure to high levels of radiation and become more severe as the exposure increases.

non-stochastic effects

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問題一覧

are waves that are created as a result of vibrations between an electric field and a magnetic field that moves through space at the speed of light.

em waves

are similar in that they all move at the speed of light and consist of moving electric and magnetic fields.

em waves

All of them exhibit the same characteristic of not requiring any medium to propagate the energy.

em waves

parts of em waves

crest, trough, wavelength, frequency

highest point of the wave.

crest

lowest point of the wave.

trough

distance between crest to crest or trough to trough.

wavelength

the number of waves that pass a fixed point in a given amount of time

frequency

are perpendicular to the direction in which the waves move.

oscillating electric and magnetic field

transverse waves

em waves

em spectrum based on

frequency, wavelength, photon energy

The behavior of an electromagnetic wave in a substance depends on its

frequency, wavelength

These oscillations may occurvat very low frequency or at an extremely high frequency and the entire range of frequencies is referred to as

em spectrum

are used for communication such as television and radio.

radio waves

They do not cause damage if absorbed by the human body, and they can be reflected to change their direction.

radio waves

These properties make them ideal for communications.

radio waves

are used for cooking food and for satellite communications.

microwaves

have frequencies which are easily absorbed by molecules in food.

high frequency microwaves

pass easily through the atmosphere, so they can pass between stations on Earth and satellites in orbit.

microwaves

is used by electrical heaters, cookers for cooking food, and by infrared cameras which detect people in the dark.

infrared

has frequencies which are absorbed by some chemical bonds.

infrared

useful for electrical heaters and for cooking food.

infrared

All objects emit

infrared light

is useful for detecting people in the dark.

termal imaging

is the light we can see.

visible light

It is used in fiber optic communications, where coded pulses of light travel through glass fibres from a source to a receiver.

visible light

can kill bacteria that are present in water

ultraviolet

this sterilizes the water and makes it safe to drink.

ultraviolet

is also good for the skin as it helps to make vitamin D.

ultraviolet

are ionizing electromagnetic radiation

gamma rays

obtained by the decay of an atomic nucleus.

gamma rays

are more penetrating, in matter, and can damage living cells to a great extent.

gamma rays

are used in medicine (radiotherapy), industry (sterilization and disinfection) and the nuclear industry.

gamma rays

can be described in terms of a stream of particles contain a particle of energy called photons.

em radiation

a particle of energy

photons

the process of emitting energy

radiation

particles, waves

such as high energy of protons, neutrons, electrons, atoms, and ions;

particles

either light or sound.

waves

natural/background radiation, man-made radiation

These are composed of unstable atoms that give off their excess energy until it becomes stable.

radioactive materials

This happens during the spontaneous change to be more stable.

radioactive decay

One way to describe radioactivity of an element is its

half-life

which is the time it takes for half of the atoms of a radioactive substance to decay.

half-life

can range from less than a millionth of a second to millions of years.

half-life

The standard unit of measurement of exposure to ionizing radiation.

sievert (Sv)

This measure the amount of radiation and in 1 Sv is 100x larger than 1 rem.

rem (roentgen equivalent man)

It is often useful to express the rate at which dose is delivered.

rem (roentgen equivalent man)

Radiation affects us in two ways:

stochastic effects, non-stochastic effects

associated with long term, low level exposure to radiation;

stochastic effects

appear in cases of exposure to high levels of radiation and become more severe as the exposure increases.

non-stochastic effects

ultimate energy source on earth

sun