Practice free Electromagnetic Waves (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
What oscillates in an electromagnetic wave?
In an electromagnetic wave, both the electric field (\(\vec{E}\)) and the magnetic field (\(\vec{B}\)) oscillate perpendicular to each other and to the direction of wave propagation. This is a fundamental characteristic of electromagnetic waves.
Which of the following rays are not electromagnetic waves?
The rms value of the electric field of the light coming from the sun is 720 N/c. The average total energy density of the electromagnetic wave is
The average total energy density (u) of an electromagnetic wave is given by the equation: \[ u = \frac{1}{2} \epsilon_0 E_{rms}^2 \] where \( \epsilon_0 \) is the permittivity of free space (\( 8.854 \times 10^{-12} \) F/m) and \( E_{rms} \) is the rms value of the electric field. Given \( E_{rms} = 720 \) N/C: \[ u = \frac{1}{2} \times 8.854 \times 10^{-12} \times (720)^2 \approx 4.58 \times 10^{-6} \text{ J/m}^3 \] Therefore, the correct option is \( 4.58 \times 10^{-6} \text{ J/m}^3 \).
What is the wave length of range of electromagnetic waves?
What is the wavelength range of visible light?
The wavelength range of visible light lies approximately between 4000 \( A^\circ \) (400 nm) and 7000 \( A^\circ \) (700 nm). This range corresponds to the spectrum of light that is visible to the human eye. Therefore, the correct option is \( 4000 \text{ A}^\circ \text{ to } 7000 \text{ A}^\circ \).
Unit of l oC is same as that of
In electromagnetic spectrum, the visible light lie between
The visible light spectrum ranges between ultraviolet (UV) rays and infrared (IR) rays. The wavelength of visible light ranges from approximately 400 nm to 700 nm.
Which of the following statements is not true in case of electromagnetic waves?
Electromagnetic waves are transverse waves, not longitudinal waves. Longitudinal waves are waves where the particle displacement is parallel to the direction of wave propagation, like sound waves. Electromagnetic waves have oscillating electric and magnetic fields perpendicular to the direction of propagation.
The oscillating electric and magnetic field vectors of an electromagnetic waves far away from source are oriented along
In electromagnetic waves, the electric field (E) and magnetic field (B) vectors are mutually perpendicular to each other and also perpendicular to the direction of wave propagation. They oscillate in phase, meaning that their peaks and troughs occur simultaneously.
Which of the following option of electromagnetic waves is in order of increasing frequency ?
Electromagnetic waves are ordered by increasing frequency as follows: Radio waves, Microwaves, Infrared, Visible light, Ultraviolet, X-rays, Gamma rays. Thus, 'microwaves, ultraviolet rays, x rays' is the correct order of increasing frequency.
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