In Young’s double slit experiment, the two slits are separated by 1 mm and the screen is placed at 1 m away. It produces the second dark fringe at At a distance of 2mm from the central fringe, the wavelength of monochromatic light used would be
(A) 1.3 x \(10^{-6}\) m
(B) 2 x \(10^{-6}\) cm
(C) 2 x \(10^{-9}\) m
(D) 1.3 x \(10^{-6}\) cm
(A) 1.3 x \(10^{-6}\) m
(B) 2 x \(10^{-6}\) cm
(C) 2 x \(10^{-9}\) m
(D) 1.3 x \(10^{-6}\) cm
(A) 1.3 x \(10^{-6}\) m
In young’s double slit experiment slits are separated by 0.32mm, and screen is at 1.6m away. Then find out the least distance from the central bright fringe where the bright fringes of wavelengths as 800nm and 600nm are coinciding.
(A) 10mm
(B) 12mm
(C) 1.2mm
(D) 1.0mm
In Young’s double slit experiment, the fringe width is β. if the entire arrangement is placed in a liquid of refractive index n, then the fringe width becomes
(A) n β
(B) β /(n+1)
(C) β /(n-1)
(D) β /n
In a Young’s double slit experiment the distance between the slit is 1 mm and the distance of screen from the slit is 1 m. If light of wavelength 6000 A is used then the fringe width is:
(a) 0.4 mm
(b) 0.5 mm
(c) 0.6 mm
(d) 0.8 mm
In Young’s double-slit experiment, the phase difference between the light waves reaching the third bright fringe from the central fringe will be (λ=6000 Å)
(a) zero
(b)2
(c) 4
(d) 6
In Young’s double slit experiment the distance between the slit and the screen is doubled and the separation between the slit is reduced to half. The fringe width:
(a) is doubled
(b) become four time
(c) is halved
(d) remain unchanged
In double –slit experiment the distance of the second dark fringe from the central line is 3 mm. The distance of the fourth bright fringe from the central line is
(A) 6 mm
(B) 8mm
(C) 12 mm
(D) 16 mm
In a Young’s double slit experiment, the separation between the slits is 0.1 mm, the wavelength of light used is 600 nm and the interference pattern is observed on a screen 1 m away. Find the separation between bright fringes.
(A) 6.0 mm
(B) 6.6 mm
(C) 6 m
(D) 60 cm
In a double slit interference pattern, the first maxima for infrared light would be
a. at the same place as the first maxima for green light
b. closer to the centre than the first maxima for green light
c. farther from the centre than the first maxima for green light
d. infrared light does not produce an interference pattern
Two cables of copper are of equal lengths. One of them has a single wire of area of cross- section A, while other has 10 wires of cross-sectional area A/10 each. Give their suitability for transporting A.C. and D.C.
(a) only multiple strands for A.C., either for D.C.
(b) only multiple strands for A.C., only single strand for D.C.
(c) only single strand for D.C., either for A.C.
(d) only single strand for A.C., either for D.C.
A Daniel cell is balanced on 125 cm length of a potentiometer wire. When the cell is short circuited with a 2 Ω resistance, the balancing length obtained is 100 cm. Internal resistance of the cell will be
(a) 1.5 Ω
(b) 0.5 Ω
(c) 1.25 Ω
(d) 4/5 Ω
Which field is more effective in electromagnetic waves?
(A) Electric field
(B) magnetic field
(C) both electric and magnetic field
(D) none of these
In the diffraction pattern due to single slit, at the position of 2nd maximum the path difference between the wavelets from the opposite edges of the slit is
I. 5λ/2
II. 3λ/2
III. 2λ
IV. λ
Wavefront is the locus of all points, where the particles of the medium vibrate with the same
(a) phase.
(b) amplitude.
(c) frequency.
(d) period.
Two point charges, \(q_1\) = 10 × \(10^{-8}\)C, \(q_2\) = -2 × \(10^{-8}\)C are seperated by a distance of 60 cm in air what is the electrostatic potential energy of the system.
1) 3 joule
2) -3 joule
3) -3 x\(10^{-5}\) joule
4) 3 x\(10^{-5}\) joule