Tag: physics

Questions Related to physics

If light waves emitted by an ordinary source, for what period of time, the phase remains constant :-

physics wave optics huygens wave theory and wavefront wave propagation (huygens' construction) theories on light wave behaviour

  1. $10 sec$

  2. $1 sec$

  3. $10^{-3}$ sec

  4. $10^{-8}$ sec

Show answer
Correct Option: B

According to Huygen's theory of light

physics wave optics huygens wave theory and wavefront wave propagation (huygens' construction) theories on light wave behaviour

  1. light is stream of photon

  2. light is wave

  3. light behaves as particle

  4. None of the above

Show answer
Correct Option: B

In the case of parallel beam,

physics wave optics huygens wave theory and wavefront wave propagation (huygens' construction) theories on light wave behaviour

  1. intensity gradually increases

  2. intensity gradually decreases

  3. intensity remains constant

  4. None of these

Show answer
Correct Option: D

Huygen's theory of light

physics wave optics huygens wave theory and wavefront wave propagation (huygens' construction) theories on light wave behaviour

  1. explain reflection and refraction of light

  2. explain scattering of light

  3. explain interference of light, diffraction of light

  4. None of the above

Show answer
Correct Option: C

According to huygen's theory of secondary waves,following can be explained-

physics wave optics huygens wave theory and wavefront wave propagation (huygens' construction) theories on light wave behaviour

  1. Propagation of light in medium

  2. Reflection of light

  3. Refrection of light

  4. All of the above

Show answer
Correct Option: A,B

Huygen's theory of secondary waves can be used of find-

physics wave optics huygens wave theory and wavefront wave propagation (huygens' construction) theories on light wave behaviour

  1. Velocity of light

  2. The wavelength of light

  3. Wave front geometrically

  4. Magnifying power of microscope

Show answer
Correct Option: B

Huygen's theory of secondary waves can be used to find-

physics wave optics huygens wave theory and wavefront wave propagation (huygens' construction) theories on light wave behaviour

  1. Velocity of light

  2. The wavelength of light

  3. Wave front geometrically

  4. Magnifying power of microscope.

Show answer
Correct Option: B

Coherent sources can be obtained:

physics wave optics huygens wave theory and wavefront wave propagation (huygens' construction) theories on light wave behaviour

  1. only by division of wave front

  2. only by division of amplitude

  3. both by division of amplitude and wave front

  4. none of the above

Show answer
Correct Option: C

The wave theory in its original form was first postulated by 

physics wave optics huygens wave theory and wavefront wave propagation (huygens' construction) theories on light wave behaviour

  1. Issac Newton

  2. Thomas Young

  3. Christian Huygens

  4. Augustine Jean Fresnel

Show answer
Correct Option: C
Explanation:

Christian Huygens postulated wave theory.

Assertion  $(A):$  Microwaves are better carries of signals than optical waves
Reason  $(R):$  Microwaves move faster than optical waves

physics wave optics huygens wave theory and wavefront wave propagation (huygens' construction) theories on light wave behaviour

  1. Both $A$ and $R$ are true and $R$ is correct explanation of $A$

  2. Both $A$ and $R$ are true and $R$ is not the correct explanation of $A$

  3. $A$ is true but $R$ is false

  4. $A$ is false but $R$ is true

Show answer
Correct Option: D
Explanation:
A frequency of an optical wave is more than the microwave so optical waves are better canes of the signal, therefore, A is false. In medium (other than vacuum) speed of 0 microwaves 1A greater than optical wave hence R 1A true.
Ans. (D)