Wave Optics Test

Result

Wave Optics Test - 54

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Weekly Quiz Competition

Question 1
4 / -1

In a single slit diffraction experiment first minimum for red light (660 nm) coincides with first maximum of some other wavelength λ\' . The value of λ\' is

A
4400 Å

B
6600 Å

C
2000 Å

D
3500 Å

Solution
Question 2
4 / -1

The ratio of intensities of consecutive maxima in the diffraction pattern due to a single slit is

A
1 : 4 : 9

B
1 : 2 : 3

C

D

Solution
Question 3
4 / -1

Light is incident normally on a diffraction grating through which the first order diffraction is seen at 32°. The second order diffraction will be seen at

A
48°

B
64°

C
80°

D
There is no second order diffraction in this case

Solution
Question 4
4 / -1

White light may be considered to be a mixture of waves with λ ranging between 3900 Å and 7800 Å. An oil film of thickness 10,000 Å is examined normally by reflected light. If µ = 1.4 , then the film appears bright for

A
4308 Å, 5091 Å, 6222 Å

B
4000 Å, 5091 Å, 5600 Å

C
4667 Å, 6222 Å, 7000 Å

D
4000 Å, 4667 Å, 5600 Å, 7000 Å

Solution
Question 5
4 / -1

Among the two interfering monochromatic sources A and B; A is ahead of B in phase by 66°. If the observation be taken from point P, such that PB – PA = λ/4. Then the phase difference between the waves from A and B reaching P is

A
156°

B
140°

C
136°

D
126°

Solution
Question 6
4 / -1

A parallel plate capacitor of plate separation 2 mm is connected in an electric circuit having source voltage 400 V. If the plate area is 60 cm², then the value of displacement current for 10^–6s will be

A
1.062 amp

B
1.062 × 10^–2 amp

C
1.062 × 10^–3 amp

D
1.062 × 10^–4 amp

Solution
Question 7
4 / -1

A long straight wire of resistance R, radius a and length l carries a constant current I. The Pointing vector for the wire will be

A

B

C

D

Solution
Question 8
4 / -1

In an electromagnetic wave, the amplitude of electric field is 1 V/m. The frequency of wave is 5 × 10¹⁴ Hz. The wave is propagating along z-axis. The average energy density of electric field, in Joule/m³, will be

A
1.1 × 10^–11

B
2.2 × 10^–12

C
3.3 × 10^–13

D
4.4 × 10^–14

Solution
Question 9
4 / -1

A laser beam can be focussed on an area equal to the square of its wavelength. A He – Ne laser radiates energy at the rate of 1mW and its wavelength is 632.8 nm. The intensity of focussed beam will be

A
1.5 × 10¹³ W/m²

B
2.5 × 10⁹ W/m²

C
3.5 × 10¹⁷ W/m²

D
None of these

Solution
Question 10
4 / -1

A lamp emits monochromatic green light uniformly in all directions. The lamp is 3% efficient in converting electrical power to electromagnetic waves and consumes 100W of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of 10m from the lamp will be

A
1.34 V/m

B
2.68 V/m

C
5.36 V/m

D
9.37 V/m

Solution