Download App

Light Waves — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsLight Waves1 Mark
Question
A Young's double slit experiment is performed with white light:
  1. The central fringe will be white.
  2. There will not be a completely dark fringe.
  3. The fringe next to the central will be red.
  4. The fringe next to the central will be violet.
✓

Answer

  1. The central fringe will be white.

  2. There will not be a completely dark fringe.

  1. The fringe next to the central will be violet.

Explanation:

The superposition of all the colours at the central maxima gives the central band a white colour. As we go from the centre to corner, the fringe colour goes from violet to red. There will not be a completely dark fringe, as complete destructive interference does not take place.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from Light Waves→Light Waves — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Instantaneous displacement current 1A in the space between the parallel plates of $1\mu\text{F}$ capacitor can be established by changing the potential difference at the rate of:
→

In order to see diffraction the thickness of the film is

(a) 100 Å

(b) 10,000 Å

(c) 1 mm

(d) 1 cm
→

Assertion : The force of repulsion between atomic nucleus and a-particle varies with distance according to inverse square law. 

Reason     : Rutherford did a-particle scattering experiment.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.
→
Two wires of same substance are given. Length and diameter of first wire are double that of the other. The resistance of first is __________ of other.
→
Figure shows some equipotential lines distributed in space. A charged object is moved from point A to point B.

→

The magnetic compass is not useful for navigation near the magnetic poles because

(a) The magnetic field near the poles is zero

(b) The magnetic field near the poles is almost vertical

(c) At low temperature, the compass needle looses its magnetic properties

(d) Neither of the above
→
Identify which of the following is the smallest discrete value of electromagnetic energy?
→
Two circular loops of equal radii are placed coaxially at some separation. The first is cut and a battery is inserted in between to drive a current in it. The current c~anges slightly because of the variation in resistance with temperature. During this period, the two loops:
  1. Attract each other.
  2. Repel each other.
  3. Do not exert any force on each other.
  4. Attract or repel each other depending on the sense of the current.
→
When a comb rubbed with dry hair attracts pieces of paper. This is because the.
→

An electron (mass = 9.1   kg; charge = 1.6   C) experiences no deflection if subjected to an electric field of 3.2   V/m, and a magnetic fields of 2.0   Wb/m2. Both the fields are normal to the path of electron and to each other. If the electric field is removed, then the electron will revolve in an orbit of radius

(a) 45 m  

(b) 4.5 m

(c) 0.45 m

(d) 0.045 m

→