In interference pattern, the energy is
A) created at maximum
(B) destroyed at minimum
(C) conserves but re-disturbed
(D) none of the above
A) created at maximum
(B) destroyed at minimum
(C) conserves but re-disturbed
(D) none of the above
(C) conserves but re-disturbed
Which of the following is conserved when light waves interfere?
(a) phase
(b) intensity
(c) amplitude
(d) none of these
The parameter of light wave which remain same after refraction
(A) speed
(B) frequency
(C) wavelength
(D) none of these
Bending of Light phenomena is shown by
(a) Polarization
(b) Diffraction
(c) Interference
(d) Dispersion
Which of the following is conserved when light waves interference?
(a) phase.
(b) intensity.
(c) amplitude.
(d) none of these.
In an interference experiment, the spacing between successive maxima and minima is
(A) λd / D
(B) λD / d
(C) dD / λ
(D) λd / 4D
The wave-front due to source situated at the infinity is
(A) Spherical
(B) Cylindrical
(C) Plane
(D) Rectangular
The wavefront due to a source situated at infinity is
(a) spherical
(b) cylindrical
(c) planar
(d) circular
The current sensitivity of a Galvanometer can be increased by decreasing-
a) Magnetic field B
b) No. of turns N
c) Torsional constant k
d) Area of the coil A
Which field is more effective in electromagnetic waves?
(A) Electric field
(B) magnetic field
(C) both electric and magnetic field
(D) none of these
The ratio of intensities at minima to the maxima in young’s double slit experiment is 9 : 25. Find the ratio of the widths of two slits.
(A) 16: 1
(B) 1: 16
(C) 4 : 1
(D) 1 : 4
In a meter bridge as shown, the balance point is found to be at 39.5 cam from the end A, when the resistor Y is of 12.5 Ω. Determine the balance point of the bridge above if X and Y are interchanged.
(a) 8.2 Ω, 40.6 cm
(b) 8.2 Ω, 60.4 cm
(c) 6.2 Ω, 60.4 cm
(d) 6.2 Ω, 39.6 cm
A dielectric induces....... in an external electric field which decreases the net electric field.
(a) current
(b) dipole moment
(c) magnetic field
(d) polarisation
Unit of magnetic dipole moment is
a) ampere meter
b) ampere/meter⁻¹
c) ampere metre²
d) ampere/metre²
The magnetic field at an outside point due to a long straight conductor carrying a constant current(I) is independent of
a) Material of the conductor
b) Radius of the conductor
c) Both (a) and (b)
d) Neither (a) nor (b)