Y11 SET 3

A student is given a slinky and asked to demonstrate wave motion. How can the student use the slinky to illustrate the difference between transverse and longitudinal waves, and what evidence should they provide to support their explanation?

• By moving the slinky side to side for transverse waves and compressing and releasing it for longitudinal waves, showing the direction of vibration relative to propagation.

• By only stretching the slinky and letting it go, observing the speed of the wave.

• By tying the slinky to a wall and shaking it randomly, noting the time it takes to stop moving.

• By measuring the length of the slinky before and after shaking it.

Given a scenario where a wave travels from deep water into shallow water, how should a student explain the change in speed and direction of the wave using the concept of refraction?

• The wave speed increases and the direction remains unchanged.

• The wave speed decreases and the direction changes due to refraction.

• The wave speed remains the same and the direction reverses.

• The wave speed increases and the direction reverses.

A wave is observed to demonstrate reflection, refraction, and the ability to travel through a medium. Using strategic reasoning, how should a student justify that this is indeed a wave?

• Because it only demonstrates reflection.

• Because it demonstrates all three phenomena required to be considered a wave.

• Because it only demonstrates refraction.

• Because it does not demonstrate any of the required phenomena.

Diffraction in a ripple tank increases when the size of the gap decreases or the wavelength increases. Which setup would best demonstrate this effect?

• Using a narrow gap and long wavelength waves, observing that the waves spread out more after passing through the gap.

• Using a wide gap and short wavelength waves, observing that the waves spread out more after passing through the gap.

• Using a narrow gap and short wavelength waves, observing that the waves do not spread out at all.

• Using a wide gap and long wavelength waves, observing that the waves do not spread out at all.

When drawing the direction of wave propagation and the normal line for a wave moving from shallow to deep water, which should be drawn first and why?

• Draw the direction of wave propagation first, then the normal line, because the propagation direction shows how the wave bends at the boundary.

• Draw the normal line first, then the direction of wave propagation, because the normal line determines the wave's speed.

• Draw both lines at the same time, as their order does not matter.

• Draw only the normal line, as the direction of propagation is not important.

• A higher refractive index means the medium is optically denser and light travels slower in it.

• A higher refractive index means the medium is optically less dense and light travels faster in it.

• A lower refractive index means the medium is optically denser and light travels slower in it.

• Refractive index is unrelated to the speed of light in a medium.

A light ray enters a block of glass at an angle and bends towards the normal. What does this indicate about the refractive indices of air and glass?

• The refractive index of glass is higher than that of air, causing the light to slow down and bend towards the normal.

• The refractive index of air is higher than that of glass, causing the light to speed up and bend away from the normal.

• The refractive indices of air and glass are equal, so the light does not bend.

• The light bends randomly regardless of the refractive indices.

• Measure the angle of incidence and use it directly in the formula to find the refractive index.

• Measure the critical angle at which total internal reflection just occurs, then use the formula to calculate the refractive index.

• Measure the speed of light in the material and use it in the formula.

• Measure the thickness of the material and use it in the formula.

A beam of white light passes through a prism and forms a spectrum. Using your understanding of how prisms refract light, explain why the colors spread out and why red and violet are deviated by different amounts.

• The prism absorbs all colors except red and violet, which are reflected.

• Each color in white light has a different wavelength, causing the prism to refract each color by a different amount; red is deviated the least and violet the most.

• The prism only allows red and violet to pass through, blocking other colors.

• The prism splits the light due to its magnetic properties, not because of refraction.

Strategically analyze why monochromatic light would not produce a spectrum when passed through a prism, unlike white light.

• Monochromatic light contains only one wavelength, so it cannot be separated into different colors.

• Monochromatic light is absorbed by the prism.

• Monochromatic light is reflected by the prism.

• Monochromatic light is too weak to pass through the prism.