Wave Optics Test

Result

Wave Optics Test - 49

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Weekly Quiz Competition

Question 1
4 / -1

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

A
6.37 × 10^–9J/m³

B
81.35 × 10^–12J/m³

C
3.3 × 10^–3J/m³

D
4.58 × 10^–6J/m³

Solution
Question 2
4 / -1

A new system of units is evolved in which the values of µ₀ and ϵ₀ are 2 and 8 respectively. Then the speed of light in this system will be

A
0.25

B
0.5

C
0.75

D
1

Solution
Question 3
4 / -1

The magnetic field amplitude of an electromagnetic wave is 2 × 10^–7 T. It\'s electric field amplitude if the wave is travelling in free space is

A
6 Vm^–1

B
60 Vm^–1

C
10/6 Vm^–1

D
None of these

Solution
Question 4
4 / -1

Electromagnetic waves can be deflected by

A
Electric field only

B
Magnetic field only

C
Both (a) and (b)

D
None of these
Question 5
4 / -1

The dielectric constant of air is 1.006. The speed of electromagnetic wave travelling in air a × 10⁸ms^–1, where a is about

A
3

B
3.88

C
2.5

D
3.2

Solution
Question 6
4 / -1

The wavelength of the matter waves is independent of

A
Charge

B
Momentum

C
Velocity

D
Mass

Solution
Question 7
4 / -1

All components of the electromagnetic spectrum in vacuum have the same

A
Energy

B
Velocity

C
Wavelength

D
Frequency

Solution
Question 8
4 / -1

The electromagnetic theory of light failed to explain

A
Photoelectric effect

B
Polarisation

C
Diffraction

D
Interference
Question 9
4 / -1

An electromagnetic wave propagating along north has its electric field vector upwards. Its magnetic field vector point towards

A
North

B
East

C
West

D
Downwards
Question 10
4 / -1

Pick out the correct statement in the propagation of electromagnetic waves for communication purposes

A
Space wave propagation is achieved by ionospheric reflection

B
Sky wave propagation is used for line-of-sight communication

C
Electromagnetic waves of frequencies higher than 30 MHz penetrate ionosphere

D
Satellite communication uses sky wave mode of propagation 252