vacuum
A perfect vacuum would contain no matter. This topic is part of Physics within Science & Nature. This page currently draws on 20 supporting questions, with answers and bonus facts available below.
vacuum trivia questions
A vacuum is a space containing very little what?
Answer: Matter
Bonus fact: A perfect vacuum would contain no matter.
Can sound travel through a perfect vacuum?
Answer: No
Bonus fact: Sound needs a material medium.
Why can suction cups stick to smooth surfaces?
Answer: Higher outside air pressure pushes them on
Bonus fact: Removing air lowers pressure beneath the cup.
The speed of light in vacuum is closest to what?
Answer: 300,000 km/s
Bonus fact: The exact value is 299,792,458 meters per second.
Early television displays commonly used what large vacuum-tube technology?
Answer: Cathode-ray tube
Bonus fact: CRT televisions used electron beams to excite a phosphor screen.
A vacuum cleaner removes dirt mainly using moving what?
Answer: Air
Bonus fact: A fan creates airflow that carries debris.
What part of a vacuum cleaner commonly traps dust while allowing air through?
Answer: Filter
Bonus fact: Filters capture fine particles.
HEPA vacuum filters are designed especially to capture what?
Answer: Very small particles
Bonus fact: HEPA filtration can trap fine dust and allergens.
Which travels faster in a vacuum: light or sound?
Answer: Light
Bonus fact: Light can travel through a vacuum; sound needs matter to travel through.
In a vacuum, at what speed do photons travel?
Answer: The speed of light
Bonus fact: All photons travel at c in vacuum, about 299,792 kilometers per second.
What household appliance commonly uses a filter to trap dust from incoming air?
Answer: Vacuum cleaner
Bonus fact: Vacuum filters capture particles before exhaust air is released.
Special relativity says the speed of what is constant for all inertial observers?
Answer: Light
Bonus fact: The speed of light in vacuum is invariant.