1
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

In the young's double slit experiment the fringe width of the interference pattern is found to be $$3.2 \times 10^{-4} \mathrm{~m}$$, when the light of wave length $$6400^{\circ} \mathrm{A}$$ is used. What will be change in fringe width if the light is replaced with a light of wave length $$4800^{\circ} \mathrm{A}$$

A
$$2.4 \times 10^{-4} \mathrm{~m}$$
B
$$1.6 \times 10^{-4} \mathrm{~m}$$
C
$$0.8 \times 10^{-4} \mathrm{~m}$$
D
$$5.6 \times 10^{-4} \mathrm{~m}$$
2
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

What will be change in wave length, if a light of wave length $$600 \mathrm{~nm}$$ travels from air enters a medium of refractive index 1.5 and continues its journey through that medium?

A
300 nm
B
200 nm
C
600 nm
D
400 nm
3
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A resistor of wire $$24 \mathrm{~cm}$$ length and resistance $$8 \Omega$$ is stretched in to a uniform wire of $$48 \mathrm{~cm}$$ length, then the new resistance will be :

A
$$32 \Omega$$
B
$$8 \Omega$$
C
$$16 \Omega$$
D
$$4 \Omega$$
4
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A metallic rod of $$10 \mathrm{~cm}$$ is rotated with a frequency 100 revolution per second about an axis perpendicular to its length and passing through its one end in uniform transverse magnetic field of strength $$1 \mathrm{~T}$$. The emf developed across its ends is:

A
628 V
B
3.14 V
C
31.4 V
D
6.28 V
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