Exams › JEE Main › Physics

Choose the correct option relating wavelengths of different parts of electromagnetic wave spectrum : (1) λ_radio waves > λ_micro waves > λ_visible > λ_x-rays (2) λ_visible > λ_x-rays > λ_radio waves > λ_micro waves (3) λ_x-rays < λ_visible < λ_radio waves < λ_micro waves (4) λ_visible < λ_micro waves < λ_radio waves < λ_x-rays

1. λ_radio waves > λ_micro waves > λ_visible > λ_x-rays
2. λ_visible > λ_x-rays > λ_radio waves > λ_micro waves
3. λ_x-rays < λ_visible < λ_radio waves < λ_micro waves
4. λ_visible < λ_micro waves < λ_radio waves < λ_x-rays

Correct answer: λ_x-rays < λ_visible < λ_radio waves < λ_micro waves

Solution

The correct option accurately reflects the order of wavelengths in the electromagnetic spectrum, where x-rays have the shortest wavelengths, followed by visible light, and then radio waves, which have the longest wavelengths.

Related JEE Main Physics questions

• A ring carrying uniform charge has radius 10 cm and spins about its own axis with a frequency of $10^4$ revolutions per second. At a point on the axis, 20 cm from the centre, the ratio of the electric-field energy density to the magnetic-field energy density is $9.1 \times 10^{10}$. Determine the value of $a$.
• A plane electromagnetic wave falls on a material surface. If it transfers momentum \(p\) and energy \(E\), which statement is true?
• The intensity of an electromagnetic wave is given by which expression?
• For an electromagnetic wave moving in vacuum, the electric field is expressed as \(E = E_0\sin(kx - \omega t)\). Which of the following quantities does not depend on the wavelength?
• When an electromagnetic wave enters the ionised region of the ionosphere, the moving electron cloud gives rise to a space current, while the electric field also produces a capacitive displacement current. In this situation, what is the phase relation between the space current and the displacement current?
• The rms electric field associated with sunlight is 720 N/C. What is the mean total energy density of this electromagnetic wave?

⚔️ Practice JEE Main Physics free + battle 1v1 →