In the Young’s double slit experiment both the slits are similar. If the length of one of the slits is halved, which of the following is true?
(a) Bright fringes become narrower.
(b) Bright fringes become wider.
(c) Dark fringes become darker
(d) Dark fringes become brighter.
(a) Bright fringes become narrower.
(b) Bright fringes become wider.
(c) Dark fringes become darker
(d) Dark fringes become brighter.
(d) Dark fringes become brighter.
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 central point on the screen is:
(a) bright
(b) dark
(c) first bright and later dark
(d) first dark and later bright
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 Young’s double slit experiment, the central point on the screen is:
a. Bright
b. Dark
c. First bright and later dark
d. First dark and later bright
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 Young’s double slit experiment, the fringe width is β . If the entire arrangement is now placed inside a liquid of refractive index μ , the fringe width will become
(a) μ β
(b) β/μ
(c) β/μ+1
(d) β/μ−1
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
Electric potential at a distance r from the point charge is proportional to
1. \(r^2\)
2. r-1
3. r0
4. r+1
Charge in motion within the Gaussian surface gives changing physical quantity
(A) Electric field
(B) Electric flux
(C) Charge
(D) Gaussian surface area
When interference of light takes place
(a) energy is created in the region of maximum intensity
(b) energy is destroyed in the region of maximum intensity
(c) conservation of energy holds good and energy is redistributed
(d) conservation of energy does not hold good
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.
A single slit diffraction pattern is obtained using a beam of red light What happened if the red light is replaced by the blue light?
(a) There is no change in diffraction pattern
(b) Diffraction fringes become narrower and crowded
(c) Diffraction fringes become broader and farther apart
(d) The diffraction pattern disappear
The magnetic flux linked with a coil is given by the equation Ø = 2t² + 2t + 4 weber. The magnitude of induced emf at time t=2s will be
(a) 16 V
(b) 10V
(c) 12V
(d) 8V
The SI unit of inductance is the henry. It can be written as
(a) weber/ampere
(b) volt-second/ampere
(c) joul/(ampere)²
(d) ohm-second