wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Unit of energy density of electromagnetic wave is:


A

Jm-3

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B

Jm-2

No worries! We‘ve got your back. Try BYJU‘S free classes today!
C

Wm-2

No worries! We‘ve got your back. Try BYJU‘S free classes today!
D

None of these

No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is A

Jm-3


Explanation of correct option

Option(A)-

Energy density:

  1. It could be defined as the amount of energy stored in a system per unit volume. It is expressed as the ratio of the energy of a given system and its total volume.
  2. Mathematically the energy density of a given system is expressed as, Energydensity=EnergyVolume.
  3. The SI unit of energy is Joules J and the SI unit of volume is meter-cube m3. So, the unit of energy density is J/m3.
  4. Hence, the unit of the energy density of electromagnetic wave is J/m3.

Explanation of incorrect options

Option(B)-

The volume of a 3D solid is calculated by multiplying length, breadth and height, therefore, m-3and not m-2

Option(C)-

Energy is measured in Joules(J) and not weber (W)

Option(D)-

None of these cannot be the right option since option A is.correct.

Hence, option A is correct


flag
Suggest Corrections
thumbs-up
2
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Wave Reflection and Transmission
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon