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Refraction of water waves - class-XI

refraction of water waves

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Questions

Question 1 Multiple Choice (Single Answer)

The higher the frequency of light?

  1. The longer (larger) its wavelength.
  2. The shorter (smaller) its wavelength.
  3. The greater its velocity in a vacuum.
  4. The redder it will be
Question 2 Multiple Choice (Single Answer)

A point source of light is placed at origin, in air. The equation of wave front of the wave at time $t$, emitted by source at $t=0$, is $(Take\ refractive\ index\ of\ air\ ms\ 1)$

  1. $x+y+z=et$
  2. $x^{2}+y^{2}+z^{2}=t^{2}$
  3. $xy+yz+zx=e^{2}t^{2}$
  4. $x^{2}+y^{2}+z^{2}=e^{2}t^{2}$
Question 3 Multiple Choice (Single Answer)

When the beam of light travels in a medium with lesser velocity than that of in vaccum then the value of wavelength and frequency will respectively

  1. Increase, decrease
  2. Increase, unchanged
  3. Decrease, unchanged
  4. Decrease, decrease
Question 4 Multiple Choice (Multiple Answers)

Consider a light wave that passes from air into a very thick clear glass block that has its opposite internal side mirrored (facing into the glass). The light ray passes into the glass block at an angle greater than $0^{\circ}$ and less than $90^{\circ}$, strikes the mirrored surface and reflects back through the glass into the air.
What happens while the light ray is in the glass block but before it strikes the mirrored surface?

  1. The frequency of the waves increases
  2. The frequency of the waves decreases
  3. The wavelength of the waves decreases
  4. The velocity of the waves decreases
  5. The period of the waves increases
Question 5 Multiple Choice (Single Answer)

Assertion (A) : Velocity of light is more in rarer medium than in denser medium
Reason (R) : Light waves are longitudinal mechanical waves

  1. Statement A is correct R is wrong
  2. Statement A is correct R is right
  3. Statement A and R both are correct but R is not explaining A
  4. Statement A and R both are correct and R is explaining A
Question 6 Multiple Choice (Single Answer)


(A) Light is a form of electromagnetic radiation and non-mechanical waves.
(B) Light waves do not require a material as a medium for propagation.

  1. Only A is true.
  2. Only B is true.
  3. Both A and B are true.
  4. Both A and B are false.
Question 7 Multiple Choice (Single Answer)

An observer is moving with half the speed of light towards stationary microwave source emitting waves at frequency 10 GHz. What is the frequency of the microwave measured by the observer ?(speed of light = $3 \times10^{8} \ ms^{-1}$)

  1. 15.3 GHz
  2. 10.1 GHz
  3. 12.1 GHz
  4. 17.3 GHz
Question 8 Multiple Choice (Single Answer)

In frounhofer diffraction by a single slit, a position where first order minimum is formed by the wave length $6000\mathring { A } $, first order maximum is formed due to unknown wavelength, the unknown wavelength is

  1. $5000\mathring { A } $
  2. $6000\mathring { A } $
  3. $4000\mathring { A } $
  4. $9000\mathring { A } $
Question 9 Multiple Choice (Single Answer)

Two monochromatic light source, A and B , emit the same number of photons wavelength of A is $ \lambda _A = 400 nm $, and that of $ \lambda _B =600 nm $. the power of radiated

  1. equal to that of source A
  2. less than that source A
  3. greater than that of source A
  4. can not be compared to that source A using the available data
Question 10 Multiple Choice (Single Answer)

When a ray of light enters from air in to water then its wavelength

  1. decreases
  2. increases
  3. remains unchanged
  4. becomes infinity
Question 11 Multiple Choice (Single Answer)

The wavelength of a monochromatic light in vacuum is $\lambda$. If travels from vacuum to a medium of absolute refractive index $\mu$. The ratio of wavelength of the incident and refracted wave is

  1. $\mu^2 : 1$
  2. 1 : 1
  3. $\mu$ : 1
  4. 1:$\mu$
Question 12 Multiple Choice (Single Answer)

The frequency of light of wave length 5000 $\mathring {A}$ is

  1. $1.5 \times 10^5 Hz$
  2. $6 \times 10 Hz$
  3. $6 \times 10^{14} Hz$
  4. $7.5 \times 10^{15} Hz$
Question 13 Multiple Choice (Single Answer)

When a ray of light is refracted, the wavelength of the refracted light changes. Identify which of the following explain this phenomenon?
I. Some of the energy of the incident ray is carried away by the reflected ray
II. The boundary surface absorbs some of the energy of the incident ray
III. The incident and refracted rays do not travel with the same velocity

  1. I only
  2. II only
  3. III only
  4. I and II only
  5. I, II, and III
Question 14 Multiple Choice (Single Answer)

Calculate the wavelength of light when it passing through diamond whose refractive index is 2.4 given that wavelength of light in air is 500 nm.

  1. 208 nm
  2. 357 nm
  3. 500 nm
  4. 700 nm
  5. 1,200 nm
Question 15 Multiple Choice (Single Answer)

An emission spectrum consists of bright spectral lines on a dark back ground. Which one of the following does not correspond to the bright spectral lines?

  1. Frequency of emitted radiation
  2. Wave length of emitted radiation
  3. Energy of emitted radiations
  4. Velocity of light
Question 16 Multiple Choice (Single Answer)

Ray optics holds good when characteristic dimensions are

  1. Of the same order as the wavelength of light
  2. Much smaller than the wavelength of light
  3. Of the order of one millimetre
  4. Much larger than the wavelength of light
Question 17 Multiple Choice (Single Answer)

What is the wavelength of light for the least energetic photon emitted in the Lyman series of the hydrogen spectrum. (take hc = 1240 eV nm)

  1. 102 nm
  2. 150 nm
  3. 82 nm
  4. 122 nm
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