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The electric vector vibration of an electromagnetic wave is given by E=(50 NC⁻1) sin ω(t-x/c). The intensity of the wave is
Options
(a) 2.3 Wm⁻²
(b) 4.3 Wm⁻²
(c) 3.3 Wm⁻²
(d) 1.8 Wm⁻²
Correct Answer:
3.3 Wm⁻²
Explanation:
The Intensity is, I = (1/2) ε₀E₀²c
I = (1/2) × (8.85 × 10⁻¹² N-m²C⁻²) × (50 NC⁻¹)² × 3 × 10⁸ ms⁻¹
I = 3.3 Wm⁻²
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Topics: Electromagnetic Waves
(28)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A radioactive substance emits n beta particles in the first 2 s and 0.5 n beta
- A closely wound solenoid of 2000 turns and area of cross-section 1.5 x 10⁻⁴ m² carries
- An object is placed 30 cm away from a convex lens of focal length 10 cm and a sharp
- An inductor is connected to an a.c. source when compared to voltage,
- The period of oscillation of a mass M suspended from a spring of negligible mass is T
Topics: Electromagnetic Waves (28)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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