Mechanics
Units & Measurement and Dimensions
MCQ (Single Correct Answer)
Motion in a Straight Line
MCQ (Single Correct Answer)
Work, Energy and Power
MCQ (Single Correct Answer)
Center of Mass and Collision
MCQ (Single Correct Answer)
Simple Harmonic Motion
MCQ (Single Correct Answer)
Heat and Thermodynamics
MCQ (Single Correct Answer)
Electromagnetism
Current Electricity
MCQ (Single Correct Answer)
Moving Charges and Magnetism
MCQ (Single Correct Answer)
Magnetism and Matter
MCQ (Single Correct Answer)
Electromagnetic Induction
MCQ (Single Correct Answer)
Alternating Current
MCQ (Single Correct Answer)
Electromagnetic Waves
MCQ (Single Correct Answer)
Modern Physics
Dual Nature of Radiation
MCQ (Single Correct Answer)
Semiconductor Devices and Logic Gates
MCQ (Single Correct Answer)
Communication Systems
MCQ (Single Correct Answer)
1
KCET 2021
MCQ (Single Correct Answer)
+1
-0

A slit of width $$a$$ is illuminated by red light of wavelength $$6500 \mathop A\limits^o$$. If the first diffraction minimum falls at $$30^{\circ}$$, then the value of $$a$$ is

A
$$6.5 \times 10^{-4} \mathrm{~mm}$$
B
1.3 micron
C
$$3250 \mathop A\limits^o$$
D
$$26 \times 10^{-4} \mathrm{~cm}$$
2
KCET 2021
MCQ (Single Correct Answer)
+1
-0

Which of the following statements are correct with reference to single slit diffraction pattern?

(I) Fringes are of unequal width.

(II) Fringes are of equal width.

(III) Light energy is conserved.

(IV) Intensities of all bright fringes are equal.

A
Both (I) and (III)
B
Both (I) and (IV)
C
Both (II) and (IV)
D
Both (II) and (III)
3
KCET 2021
MCQ (Single Correct Answer)
+1
-0

In the Young's double slit experiment a monochromatic source of wavelength $$\lambda$$ is used. The intensity of light passing through each slit is $$I_0$$. The intensity of light reaching the screen $$S_C$$ at a point $$P$$, a distance $$x$$ from $$O$$ is given by (Take, $$d<< D$$)

KCET 2021 Physics - Wave Optics Question 16 English

A
$$I_0 \cos ^2\left(\frac{\pi D}{\lambda d} x\right)$$
B
$$4 I_0 \cos ^2\left(\frac{\pi d}{\lambda D} x\right)$$
C
$$I_0 \sin ^2\left(\frac{\pi d}{2 \lambda D} x\right)$$
D
$$4 I_0 \cos \left(\frac{\pi d}{2 \lambda D} x\right)$$
4
KCET 2020
MCQ (Single Correct Answer)
+1
-0

Three polaroid sheets $$P_1, P_2$$ and $$P_3$$ are kept parallel to each other such that the angle between pass axes of $$P_1$$ and $$P_2$$ is $$45^{\circ}$$ and that between $$P_2$$ and $$P_3$$ is $$45^{\circ}$$. If unpolarised beam of light of intensity $$128 \mathrm{~Wm}^{-2}$$ is incident on $$P_1$$. What is the intensity of light oming out of $$P_3$$ ?

A
$$128 \mathrm{~Wm}^{-2}$$
B
zero
C
$$16 \mathrm{~Wm}^{-2}$$
D
$$64 \mathrm{~Wm}^{-2}$$
KCET Subjects