Download App

Wave Optics — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsWave Optics1 Mark
Question

In a Young’s double slit experiment, the source illuminating the slits is changed from blue to violet. The width of the fringes

(a) Increases

(b) Decreases

(c) Becomes unequal

(d) Remains constant
✓

Answer

(b) Decreases

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 [1M]" from Wave Optics→Wave Optics — all question types→Physics STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

Pick the correct options:
  1. Magnetic field is produced by electric charges only.
  2. Magnetic poles are only mathematical assumptions having no real existence.
  3. A north pole is equivalent to a clockwise current and a south pole is equivalent to an anticlockwise current.
  4. A bar magnet is equivalent to a long, straight current.
→

The resultant magnetic moment of neon atom will be

(a) Infinity

(b) mB

(c) Zero  

(d) mB/2
→

By a monochromatic wave, we mean

(a) A single ray

(b) A single ray of a single colour    

(c) Wave having a single wavelength

(d) Many rays of a single colour
→

A condenser having a capacity of 6mF is charged to 100 V and is then joined to an uncharged condenser of 14 μF  and then removed. The ratio of the charges on 6mF  and 14mF  and the potential of 6mF will be

(a)  and 50 volt

(b)  and 30 volt

(c)  and 30 volt

(d)  and 0 volt
→

If  are the lengths of the emitter, base and collector of a transistor then

(a)  

(b)  

(c)  

(d)  
→
Neutron decay in free space is given as follows n1 → 1H1 + e-1 + [] Then the parenthesis [] represents a:
→

Assertion : Short wave bands are used for transmission of radio waves to a large distance.

Reason    :  Short waves are reflected by ionosphere

(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.

→
The wavelength of light used in an optical instrument is $\lambda_1=4000 Å$ and $\lambda_2=5000 Å$. The ratio of their corresponding resolution powers will be :
→

If a bar magnet of magnetic moment M is freely suspended in a uniform magnetic field of strength B, the work done in rotating the magnet through an angle θ is

(a) MB(1- sinθ

(b) MB sinθ

(c) MB cosθ

(d) MB(1 – cosθ)
→
When light propagates in vaccum there is an electric field and a magnetic field. Which of the following is not true about these field?
→