Speed In Vacuum
Speed of electromagnetic waves in vacuum equals:
Select the correct option:
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
More electromagnetic waves Practice Questions
A plane electromagnetic wave in vacuum has a peak electric field of 30 V/m, and an analyst computes ...
A plane electromagnetic wave in vacuum has a peak electric field of 30 V/m, and an analyst computes ...
In a plane electromagnetic wave, how do the frequencies of the oscillating electric field and the os...
In a plane electromagnetic wave, how do the frequencies of the oscillating electric field and the os...
A television transmitter broadcasts at a frequency of 6.0 × 10⁸ Hz, and a technician must determine ...
A television transmitter broadcasts at a frequency of 6.0 × 10⁸ Hz, and a technician must determine ...
Which property of microwaves makes them especially suitable for use in radar systems and in speed de...
Which property of microwaves makes them especially suitable for use in radar systems and in speed de...
Which electromagnetic radiation from sunlight is largely absorbed by the ozone layer, protecting liv...
Which electromagnetic radiation from sunlight is largely absorbed by the ozone layer, protecting liv...
The electric flux through a certain surface changes at a steady rate of 2.0 × 10⁴ V·m per second, an...
The electric flux through a certain surface changes at a steady rate of 2.0 × 10⁴ V·m per second, an...
Among the following electromagnetic radiations, which one originates from transitions within atomic ...
Among the following electromagnetic radiations, which one originates from transitions within atomic ...
Why can electromagnetic waves travel through the vacuum of outer space while sound waves from the Su...
Why can electromagnetic waves travel through the vacuum of outer space while sound waves from the Su...
A doctor uses a particular electromagnetic radiation to visualise bone fractures because it penetrat...
A doctor uses a particular electromagnetic radiation to visualise bone fractures because it penetrat...
A laser delivers an average intensity of 6.0 W/m² onto a screen, and a researcher needs the average ...
A laser delivers an average intensity of 6.0 W/m² onto a screen, and a researcher needs the average ...
Weather satellites detect a form of electromagnetic radiation strongly emitted by warm bodies, often...
Weather satellites detect a form of electromagnetic radiation strongly emitted by warm bodies, often...
A perfectly absorbing solar sail receives light of energy \cup from the Sun over a given interval, ...
A perfectly absorbing solar sail receives light of energy \cup from the Sun over a given interval, ...
About This Question
- Subject
- physics
- Chapter
- electromagnetic waves
- Topic
- speed in vacuum
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
1/√(ε0μ0)
Maxwell's equations predict that the speed of EM waves (c) in a vacuum is determined by the fundamental constants of electricity (permittivity ϵ0) and magnetism (permeability μ0): c=ϵ0μ01 Substituting ϵ0≈8.854×10−12 F/m and μ0=4π×10−7 H/m gives c≈3×108 m/s.
This easy difficulty physics question is from the chapter electromagnetic waves, covering the topic of speed in vacuum. It appeared in the 2025 exam.
Looking for more practice? Explore all physics questions or browse electromagnetic waves questions on RankGuru.