Who decides how long a second is? Flashcards
gather
/ˈɡæð.ər/
verb
to understand or believe something as a result of something that has been said or done
Researchers from around the world gathered to answer a long-running scientific question
pendulum
/ˈpen.dʒəl.əm/
noun
con lắc
The swing of a pendulum
precise
/prɪˈsaɪs/
adjective
exact and accurate
But how precise are those measurements?
ancient
/ˈeɪn.ʃənt/
adjective
of or from a long time ago, having lasted for a very long time
Ancient civilizations measured time with unique calendars that tracked the steady march of the night sky
globe
/ɡləʊb/
noun
quả địa cầu
The Gregorian calendar began to spread across the globe
colonialism
/kəˈləʊ.ni.ə.lɪ.zəm/
noun
chủ nghĩa thực dân
The Gregorian calendar began to spread across the globe alongside British colonialism
revolution
/ˌrev.əˈluː.ʃən/
noun
a circular movement
The Gregorian calendar defined a day as a single revolution of the Earth about its axis
axis
/ˈæk.sɪs/
noun
trục
The Gregorian calendar defined a day as a single revolution of the Earth about its axis
railway
/ˈreɪl.weɪ/
noun
đường sắt
It wasn’t until society became interconnected through fast-moving railways that cities needed to agree on
exact timekeeping
timekeeping
/ˈtaɪmˌkiː.pɪŋ/
noun
the ability to arrive at a place at the time expected
It wasn’t until society became interconnected through fast-moving railways that cities needed to agree on
exact timekeeping
consist of something
/kənˈsɪst/
phrasal verb
to be made of or formed from something
An atom consists of negatively charged
electrons orbiting a positively charged nucleus at a consistent frequency
orbit
/ˈɔː.bɪt/
verb
to follow a curved path around a planet or star
An atom consists of negatively charged
electrons orbiting a positively charged nucleus at a consistent frequency
consistent
/kənˈsɪs.tənt/
adjective
always behaving or happening in a similar, especially positive, way
An atom consists of negatively charged
electrons orbiting a positively charged nucleus at a consistent frequency
frequency
/ˈfriː.kwən.si/
noun
tần số
An atom consists of negatively charged
electrons orbiting a positively charged nucleus at a consistent frequency
mechanic
/məˈkæn.ɪk/
noun
cơ học
The laws of quantum mechanics keep these electrons in place
expose
/ɪkˈspəʊz/
verb
to remove what is covering something so that it can be seen
You expose an atom to an electromagnetic field such as light or radio waves
orientation
/ˌɔː.ri.enˈteɪ.ʃən/
noun
hướng
You can slightly disturb an electron’s orientation
disturb
/dɪˈstɜːb/
verb
to move or change something from its usual position
You can slightly disturb an electron’s orientation
tweak
/twiːk/
verb
to change something slightly, especially in order to make it more correct, effective, or suitable
vibration
/vaɪˈbreɪ.ʃən/
noun
rung động
If you briefly tweak an electron at just the right frequency, you can create a vibration that resembles a ticking
pendulum
resemble
/rɪˈzem.bəl/
verb
to look like or be like someone or something
If you briefly tweak an electron at just the right frequency, you can create a vibration that resembles a ticking
pendulum
vaporize
/ˈveɪ.pər.aɪz/
verb
làm bay hơi
Researchers vaporize the atoms, converting them to a less interactive and volatile state
volatile
/ˈvɒl.ə.taɪl/
adjective
likely to change suddenly and unexpectedly, especially by getting worse
Researchers vaporize the atoms, converting them to a less interactive and volatile state
remarkable
/rɪˈmɑː.kə.bəl/
adjective
unusual or special and therefore surprising and worth mentioning
This process doesn’t slow down the atom’s remarkably fast
ticking
oscillate
/ˈɒs.ɪ.leɪt/
verb
to move repeatedly from one position to another
Some atoms can oscillate over nine billion times per second
conference
/ˈkɒn.fər.əns/
noun
hội nghị
satellite
/ˈsæt.əl.aɪt/
noun
vệ tinh
