Question

What is the path difference of destructive interference

(a) nl

(b) n(λ  + 1) 

(c)  

(d)  

Answer

(d)  

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

Similar questions

A point object O is placed in front of a glass rod having spherical end of radius of curvature 30 cm.  The image would be formed at

(a) 30 cm left

(b) Infinity

(c) 1 cm to the right

(d) 18 cm to the left

In a triode amplifier,  kilo ohm and load resistance   kilo ohm. If the input signal voltage is 0.5 volt, then output signal voltage will be

(a) 1.25 volt

(b) 5 volt

(c) 2.5 volt

(d) 10 volt

The particle that possesses half integral spin as

(a) Photon

(b) Pion  

(c) Proton

(d) K-meson

Statement -1: NAND and NOR gates are called digital building blocks.
Statement-2: The repeated use of NAND (or NOR) gates can produce all the basis or complicated gates.

A ray of light incidents on a plane mirror at an angle of 30°.  The deviation produced in the ray is

(a) 30°

(b) 60°

(c) 90°

(d) 120°

A thermoelectric refrigerator works on

(a) Joule effect

(b) Seeback effect

(c) Peltier effect

(d) Thermonic emission

Assertion :   A P-N photodiode is made from a semiconductor for which Eg = 2.8 eV. This photo diode will not detect the wavelength of 6000 nm.

Reason    : A PN photodiode detect wavelength l if .

(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.

A person A can clearly see objects between 25cm and 200cm. Which of the following may represent the range of clear vision for a person B having muscles stronger than A, but all other parameters of eye identical to that of A?
  1. 25cm to 200cm.
  2. 18cm to 200cm.
  3. 25cm to 300cm.
  4. 18cm to 300cm.
Which of the following mirrors is used in searchlight?
Photoelectric emmision occurs only when the incident light has more than a certain minimum?