Refraction & Diffraction

The p-wave of an earthquake at the crust is incident on the crust-mantle boundary. From this model, in which medium does the p-wave have the faster speed?

• Crust

• Mantle

• Same

• Not enough information

Which of the following statements is FALSE about the p-wave as it travels from the crust to the mantle?

• The p-wave travels slower in the crust than the mantle.

• The p-wave has a shorter wavelength in the crust than the mantle.

• The p-wave has the same frequency in the crust as it does in the mantle.

• The p-wave makes a larger angle with the normal in the crust than in the mantle.

Light is incident on an air-glass boundary at 60-degrees from the normal but refracts such that its refracted angle is only 35-degrees. Calculate the index of refraction of glass assuming air's index to be n_i = 1.

• 0.67

• 1.00

• 1.33

• 1.50

When light traveling through water (n_i = 1.33) is incident on air at an angle of 60-degrees, which of the following occurs?

• The light refracts into water with an angle of 40.6 degrees.

• The light experiences total internal reflection and reflects back into the water at 60-degrees.

• The light is absorbed fully by the air.

• Undefined.

Rainbows are created as a result of two refraction-based phenomena. Based on this image, rainbows are formed because of _____ and _______. (Select two)

• reflection

• dispersion

• interference

• total internal reflection

When Young's Double Slit experiment is performed with sunlight, the position of each band of light, y, depends on all the of the following EXCEPT

• the speed of light in a vacuum, c

• the size of the double slit, d

• the wavelength of the light, lambda

• the distance between the source and screen, L

White light is incident on a diffraction grating. Red diffracts the farthest so forms the outer edge of the pattern. This is because

• red has a higher frequency than blue

• blue bends more than red

• red has a larger wavelength than blue

• red has a smaller diffraction grating, d, than blue

The same red laser is shined through diffraction gratings onto a screen the same distance away. Which diffraction grating is largest?

• A

• B

• C

• All the same

The same red laser is shined through diffraction gratings onto a screen the same distance away. Which diffraction grating is largest?

• A

• B

• C

• All the same

Blue light with a wavelength of 400 nm is incident on a double slit with a width of 5 x 10^-5m. The light is projected onto a screen than is 2 meters away. Calculate the spacing between the bright spots.

• 1.6 x 10^-5 m

• 1.6 x 10^-2 m

• 2.5 x 10^-2 m

• 1.0 x 10^-1 m