Interference of Light

In a Young's double-slit experiment the centre of a bright fringe occurs wherever waves from the slits differ in the distance they travel by a multiple of:

• quarter of a wavelength.

• half a wavelength.

• a wavelength.

• three-fourths of a wavelength.

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

In a Young's double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to:

• D/2

• D $\sqrt{2}$

• 2D

• 4D

Tags

NGSS.HS-PS4-1

Constructive interference happens when two waves are:

• out of phase.

• zero amplitude.

• in phase.

Tags

NGSS.HS-PS4-5

Two waves with phase difference 180° have resultant of amplitude

• one.

• zero.

• same as the single wave.

• doubles the single wave.

What principle is responsible for alternating light and dark bands when light passes through two or more narrow slits?

• refraction

• polarization

• diffraction

• interference

Two light sources are said to be coherent if they

• are of the same frequency.

• are of the same frequency, and maintain a constant phase difference.

• are of the same amplitude, and maintain a constant phase difference.

• are of the same frequency and amplitude.

Which of the following will increase the spacing of Young's double slit fringes

• A blue light is used instead of a red light
• the screen is moved closer to the slits
• the slits are moved closer together
• Each slit is made wider

Which of the following will decrease the spacing of Young's double slit fringes

• Increasing the frequency of the waves
• moving the screen further away
• decreasing the distance between the slits
• Using narrower slits

Tags

NGSS.HS-PS4-1