QBManager

WAVE OPTICS

283540 Which of the following rays has minimum frequency?

1 U.V. rays

2 X-rays

3 Microwaves

4 Infrared rays

Explanation:

: As we know, frequency and wavelength has the inverse relation. It means that rays which has more wavelength has minimum frequency and vice-versa.
Decreasing order of wavelength,
$λ_{microwave} > λ_{infared rays} > λ_{U.V.rays} > λ_{X-rays}$
We know,
$v = f \times λ$
$f = \frac{v}{λ}$
So, increasing order of frequency -
$f_{X - rays} > f_{U, V,rays} > f_{infrared rays} > f_{microwave}$ Hence, microwave among them has low frequency.

J and K CET- 1999

WAVE OPTICS

283545 In an experiment of diffraction through a single slit, What will happen to the width of the central maxima when the width of the slit is decreased?

1 decrease

2 remain the same

3 increase

4 many decrease or increases depending on the position of the screen

Explanation:

: We know that, fringe width $(β) = \frac{λ D}{d}$
Where, $d =$ distance between slit
$D =$ distance between slit and screen
So, according to fringe width formula, when we decreases the distance between slit then width of fringe will increases.

MP PET -2013

WAVE OPTICS

283468 Two identical light sources $S_{1}$ and $S_{2}$ emit light of same wavelength $λ$ . These light rays will exhibit interference if

1 their phase differences remain constant

2 their phases are distributed randomly

3 their light intensities remain constant

4 their light intensities change randomly

VITEEE-2010

WAVE OPTICS

283469 Colours in thin films are due to.

1 diffraction phenomenon

2 scattering phenomenon

3 interference phenomenon

4 polarization phenomenon

J and K CET- 2008

WAVE OPTICS

283540 Which of the following rays has minimum frequency?

1 U.V. rays

2 X-rays

3 Microwaves

4 Infrared rays

Explanation:

: As we know, frequency and wavelength has the inverse relation. It means that rays which has more wavelength has minimum frequency and vice-versa.
Decreasing order of wavelength,
$λ_{microwave} > λ_{infared rays} > λ_{U.V.rays} > λ_{X-rays}$
We know,
$v = f \times λ$
$f = \frac{v}{λ}$
So, increasing order of frequency -
$f_{X - rays} > f_{U, V,rays} > f_{infrared rays} > f_{microwave}$ Hence, microwave among them has low frequency.

J and K CET- 1999

WAVE OPTICS

283545 In an experiment of diffraction through a single slit, What will happen to the width of the central maxima when the width of the slit is decreased?

1 decrease

2 remain the same

3 increase

4 many decrease or increases depending on the position of the screen

Explanation:

: We know that, fringe width $(β) = \frac{λ D}{d}$
Where, $d =$ distance between slit
$D =$ distance between slit and screen
So, according to fringe width formula, when we decreases the distance between slit then width of fringe will increases.

MP PET -2013

WAVE OPTICS

283468 Two identical light sources $S_{1}$ and $S_{2}$ emit light of same wavelength $λ$ . These light rays will exhibit interference if

1 their phase differences remain constant

2 their phases are distributed randomly

3 their light intensities remain constant

4 their light intensities change randomly

VITEEE-2010

WAVE OPTICS

283469 Colours in thin films are due to.

1 diffraction phenomenon

2 scattering phenomenon

3 interference phenomenon

4 polarization phenomenon

J and K CET- 2008

WAVE OPTICS

283540 Which of the following rays has minimum frequency?

1 U.V. rays

2 X-rays

3 Microwaves

4 Infrared rays

Explanation:

: As we know, frequency and wavelength has the inverse relation. It means that rays which has more wavelength has minimum frequency and vice-versa.
Decreasing order of wavelength,
$λ_{microwave} > λ_{infared rays} > λ_{U.V.rays} > λ_{X-rays}$
We know,
$v = f \times λ$
$f = \frac{v}{λ}$
So, increasing order of frequency -
$f_{X - rays} > f_{U, V,rays} > f_{infrared rays} > f_{microwave}$ Hence, microwave among them has low frequency.

J and K CET- 1999

WAVE OPTICS

283545 In an experiment of diffraction through a single slit, What will happen to the width of the central maxima when the width of the slit is decreased?

1 decrease

2 remain the same

3 increase

4 many decrease or increases depending on the position of the screen

Explanation:

: We know that, fringe width $(β) = \frac{λ D}{d}$
Where, $d =$ distance between slit
$D =$ distance between slit and screen
So, according to fringe width formula, when we decreases the distance between slit then width of fringe will increases.

MP PET -2013

WAVE OPTICS

283468 Two identical light sources $S_{1}$ and $S_{2}$ emit light of same wavelength $λ$ . These light rays will exhibit interference if

1 their phase differences remain constant

2 their phases are distributed randomly

3 their light intensities remain constant

4 their light intensities change randomly

VITEEE-2010

WAVE OPTICS

283469 Colours in thin films are due to.

1 diffraction phenomenon

2 scattering phenomenon

3 interference phenomenon

4 polarization phenomenon

J and K CET- 2008

WAVE OPTICS

283540 Which of the following rays has minimum frequency?

1 U.V. rays

2 X-rays

3 Microwaves

4 Infrared rays

Explanation:

: As we know, frequency and wavelength has the inverse relation. It means that rays which has more wavelength has minimum frequency and vice-versa.
Decreasing order of wavelength,
$λ_{microwave} > λ_{infared rays} > λ_{U.V.rays} > λ_{X-rays}$
We know,
$v = f \times λ$
$f = \frac{v}{λ}$
So, increasing order of frequency -
$f_{X - rays} > f_{U, V,rays} > f_{infrared rays} > f_{microwave}$ Hence, microwave among them has low frequency.

J and K CET- 1999

WAVE OPTICS

283545 In an experiment of diffraction through a single slit, What will happen to the width of the central maxima when the width of the slit is decreased?

1 decrease

2 remain the same

3 increase

4 many decrease or increases depending on the position of the screen

Explanation:

: We know that, fringe width $(β) = \frac{λ D}{d}$
Where, $d =$ distance between slit
$D =$ distance between slit and screen
So, according to fringe width formula, when we decreases the distance between slit then width of fringe will increases.

MP PET -2013

WAVE OPTICS

283468 Two identical light sources $S_{1}$ and $S_{2}$ emit light of same wavelength $λ$ . These light rays will exhibit interference if

1 their phase differences remain constant

2 their phases are distributed randomly

3 their light intensities remain constant

4 their light intensities change randomly

VITEEE-2010

WAVE OPTICS

283469 Colours in thin films are due to.

1 diffraction phenomenon

2 scattering phenomenon

3 interference phenomenon

4 polarization phenomenon

J and K CET- 2008

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