The electric field for an em wave is: E = E0sin[(12 x 1015t – 4 x 107x)]. What is the speed of the em waves?a)48 x 108m / sb)3 x 108m / sc)4 x 107m / sd)12 x 1015m / sCorrect answer is option 'B'. Can you explain this answer?

Question

The electric field for an em wave is: E = E0sin[(12 x 1015t &#8211; 4 x 107x)]. What is the speed of the em waves?&#8203;a)48 x 108m / sb)3 x 108m / sc)4 x 107m / sd)12 x 1015m / sCorrect answer is option 'B'. Can you explain this answer?

Answer

- 2πx/λ]

where E0 is the amplitude of the electric field, t is the time, x is the position, and λ is the wavelength of the wave.

The electric field oscillates sinusoidally in both time and space, with a frequency of 12 x 10^15 Hz (or 12 petahertz). This corresponds to a wavelength of approximately 25 nanometers, which is in the ultraviolet range of the electromagnetic spectrum.

The amplitude of the electric field, E0, determines the intensity of the wave. Higher values of E0 correspond to more intense waves, while lower values correspond to weaker waves.

Overall, the electric field for an em wave provides important information about the properties and behavior of the wave, including its frequency, wavelength, and intensity.

Answer

K = -4 X 10^7 w(omega) = -12 X 10^15
c = w/k = 3 X 10^8 m/s

Answer

Speed of EM waves is 3×10^8 m/s

Answer

V(velocity/speed)= omega(w)/wave number (K)
V= 12×10^15/4×10^7
V=3×10^8 m/s

Similar Class 12 Doubts

a uniform electric field e is equal to 91 into 10 to the power minus 6 volt per metre is created between two charged placed as shown in the figure and electrons enter the electrical field symmetrical between the place with the speed of v is equal to 4 into 10 to the power 3 Total matches found:?

The magnetic field of an electromagnetic plane wave travelling along the negative X-direction is givenby By = 2 � 10–7 sin (0.5 � 103x + 1.5 � 1011t) T. Calculate (

Which of the following statement is false for theproperties of electromagnetic waves? [2010]

An oil drop carrying six electronic charges and having a mass of 1.6 × 10^-12 g. falls with some terminal velocity in a medium. What magnitude of vertical electric field is required to make the drop move upward with the same speed as it was formerly moving downward with? Ignore buoyancy?

A uniform electric Field of strength E exists in a region an electron of mass m enter at a point A perpendicular to x axis with velocity v. If moves through a electric Field exist at point B . The component of velocity at B is shown. (

Top Courses for Class 12

Related Content

Schools

Competitive Examinations

Quick Access Links

Technical Exams