[amp_mcq option1=”Velocity” option2=”Wavelenth” option3=”Frequency” option4=”All the above” correct=”option4″]
The correct answer is D. All the above.
In a vacuum, all electromagnetic waves have the same velocity, wavelength, and frequency. This is because the speed of light in a vacuum is the same for all electromagnetic waves, and the wavelength and frequency of an electromagnetic wave are related to its speed by the equation $c = \lambda \nu$, where $c$ is the speed of light, $\lambda$ is the wavelength, and $\nu$ is the frequency.
The speed of light in a vacuum is a fundamental constant of nature, and it is equal to $299,792,458 \frac{m}{s}$. The wavelength of an electromagnetic wave is the distance between two consecutive crests or troughs of the wave, and the frequency of an electromagnetic wave is the number of waves that pass a given point in a given amount of time.
The different types of electromagnetic waves are distinguished by their wavelength. The longest wavelengths are radio waves, which have wavelengths of meters to kilometers. The shortest wavelengths are gamma rays, which have wavelengths of less than 1 picometer (10$^{-12}$ meters).
All electromagnetic waves travel at the same speed in a vacuum, but they have different wavelengths and frequencies. This means that they have different energies. The energy of an electromagnetic wave is proportional to its frequency, so gamma rays, which have the shortest wavelengths and highest frequencies, have the most energy. Radio waves, which have the longest wavelengths and lowest frequencies, have the least energy.
Electromagnetic waves are used in a variety of technologies, including radio, television, radar, microwaves, and lasers.