Two interfering beams have intensities in the ratio of 9:4. Then the ratio of maximum to minimum intensity in the interference pattern is
(A) 25:1
(B) 13:5
(C) 5:1
(D) 3:2
(A) 25:1
(B) 13:5
(C) 5:1
(D) 3:2
(A) 25:1
Two waves having intensities in the ratio of 9:1 produce interference. The ratio of the maximum to the minimum intensity is
I. 9:1
II. 4:1
III. 1:2
IV. 1:3
Ratio of intensities of two waves are given by 4 :1. Then the ratio of the amplitudes of the two waves.
(a) 2 : 1
(b) 1 : 2
(c) 4 : 1
(d) 1 : 4
Two slits in Young’s double slit experiment have widths in the ratio 81:1. The ratio of the amplitudes of light waves is
(a) 3 :1
(b) 3 : 2
(c) 9 :1
(d) 6:1
Two monochromatic light beams intensities of I and 4I are superposed. The maximum and minimum possible intensities In the resulting beam are
(A) 5I and I
(B) 5I and 3I
(C) 9I and I
(D) 9I and 3I
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 an interference experiment, the spacing between successive maxima and minima is
(A) λd / D
(B) λD / d
(C) dD / λ
(D) λd / 4D
When light suffers reflection at the interface between water and glass, the change of phase in the reflected wave is
(a) zero..
(b) π.
(c) π/2.
(d) 2π.
Choose the SI unit of electric potential energy :
(a) Joule
(b) Coulomb
(c) Newton per coulomb
(d) Erg
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
Which field is more effective in electromagnetic waves?
(A) Electric field
(B) magnetic field
(C) both electric and magnetic field
(D) none of these
Angular width of interference fringe depends on
(A) Distance Between Slit and Screen
(B) Ratio of the wavelength and Slit width
(C) Wavelength of light
(D) Width of Slit
The penetration of light into the region of geometrical shadow is known as
a. Interference of light
b. Diffraction of light
c. Refraction of light
d. Polarization of light
A dielectric induces....... in an external electric field which decreases the net electric field.
(a) current
(b) dipole moment
(c) magnetic field
(d) polarisation
An air capacitor is charged with an amount of charge q and dipped into an oil tank. If the oil is pumped out, the electric field between the plates of capacitor will
(a) increase
(b) decrease
(c) remain the same
(d) becomes zero