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P6: Quiz 9 – Answers
P6: Quiz 9 – Answers
1)
a) Transverse wave as the oscillations are perpendicular (90°) to the direction of travel
b) The hotter identical object would emit more infrared radiation
c) Dark
d) Matt
2)
a) Place the Leslie cube onto a heat proof mat and pour in some boiling water. Leave the cube for a few minutes so that the sides of the cube heat up (we can hold a thermometer outside each of the 4 faces to check that the temperature is the same). We then place an infrared radiation detector a set distance away from the faces on Leslie’s cube; we ensure that the distances between the faces and the infrared detector are the same by drawing a line on the heat proof mat or using some tape. We measure the amount of infrared radiation being emitted from each of the 4 faces. We measure a few different temperatures, take repeats and find the mean
b) The dashed line ensures that the infrared detector is the same distance away from the 4 faces on Leslie’s cube
c)
i) Dark matt will emit the most infrared radiation
ii) Shiny white will emit the least infrared radiation
3)
a) Dark
b) Matt
4)
a) We have two metal plates that are identical in width, height and thickness, but have different surfaces facing the Bunsen burner; one of the metal plates will be black matt and the other will be light shiny. Both of the metal plates will have a ball bearing attached with some wax on the side facing away from the Bunsen burner. We place the metal plates the same distance away from the Bunsen burner, so that both of the metal plates receive the same quantity of infrared radiation. We light the Bunsen burner. We then time how long it takes for the ball bearings to fall off of the metal plates, or see which plate the ball bearing falls off of first.
b)
i) Dark black (ball bearing will fall off first)
ii) This tells us that the dark matt surface is better at absorbing infrared radiation than the light shiny surface (the quicker the ball bearing falls off, the better the surface is at absorbing infrared radiation)
a) Transverse wave as the oscillations are perpendicular (90°) to the direction of travel
b) The hotter identical object would emit more infrared radiation
c) Dark
d) Matt
2)
a) Place the Leslie cube onto a heat proof mat and pour in some boiling water. Leave the cube for a few minutes so that the sides of the cube heat up (we can hold a thermometer outside each of the 4 faces to check that the temperature is the same). We then place an infrared radiation detector a set distance away from the faces on Leslie’s cube; we ensure that the distances between the faces and the infrared detector are the same by drawing a line on the heat proof mat or using some tape. We measure the amount of infrared radiation being emitted from each of the 4 faces. We measure a few different temperatures, take repeats and find the mean
b) The dashed line ensures that the infrared detector is the same distance away from the 4 faces on Leslie’s cube
c)
i) Dark matt will emit the most infrared radiation
ii) Shiny white will emit the least infrared radiation
3)
a) Dark
b) Matt
4)
a) We have two metal plates that are identical in width, height and thickness, but have different surfaces facing the Bunsen burner; one of the metal plates will be black matt and the other will be light shiny. Both of the metal plates will have a ball bearing attached with some wax on the side facing away from the Bunsen burner. We place the metal plates the same distance away from the Bunsen burner, so that both of the metal plates receive the same quantity of infrared radiation. We light the Bunsen burner. We then time how long it takes for the ball bearings to fall off of the metal plates, or see which plate the ball bearing falls off of first.
b)
i) Dark black (ball bearing will fall off first)
ii) This tells us that the dark matt surface is better at absorbing infrared radiation than the light shiny surface (the quicker the ball bearing falls off, the better the surface is at absorbing infrared radiation)
Questions
1)
a) Is infrared a transverse or longitudinal wave? Explain your answer.
b) If we had two identical objects at different temperatures, would the cooler or hotter object emit more infrared radiation?
c) Out of light and dark surfaces (at the same temperature), which would emit more infrared radiation?
d) Out of shiny and matt surfaces (at the same temperature), which would emit more infrared radiation?
2) We can investigate the amount of infrared radiation that different surfaces emit by using Leslie cube. A diagram of the setup for the experiment is shown below.
1)
a) Is infrared a transverse or longitudinal wave? Explain your answer.
b) If we had two identical objects at different temperatures, would the cooler or hotter object emit more infrared radiation?
c) Out of light and dark surfaces (at the same temperature), which would emit more infrared radiation?
d) Out of shiny and matt surfaces (at the same temperature), which would emit more infrared radiation?
2) We can investigate the amount of infrared radiation that different surfaces emit by using Leslie cube. A diagram of the setup for the experiment is shown below.
a) Explain how we can use Leslie cube to investigate the amount of infrared radiation emitted by different surfaces.
b) Explain the role of the dashed line on the heat proof mat.
c) The four different surfaces for the Leslie cube in this experiment are:
i) Which surface would you expect to emit the most infrared radiation?
ii) Which surface would you expect to emit the least infrared radiation?
3)
a) Out of light and dark surfaces (at the same temperature), which would absorb more infrared radiation?
b) Out of shiny and matt surfaces (at the same temperature), which would absorb more infrared radiation?
4) We can investigate the amount of infrared radiation that different substances absorb by using the apparatus below.
b) Explain the role of the dashed line on the heat proof mat.
c) The four different surfaces for the Leslie cube in this experiment are:
- Dark matt surface
- Light matt surface
- Dark shiny surface
- Light shiny surface
i) Which surface would you expect to emit the most infrared radiation?
ii) Which surface would you expect to emit the least infrared radiation?
3)
a) Out of light and dark surfaces (at the same temperature), which would absorb more infrared radiation?
b) Out of shiny and matt surfaces (at the same temperature), which would absorb more infrared radiation?
4) We can investigate the amount of infrared radiation that different substances absorb by using the apparatus below.
One of the metal plates is dark matt and the other is light shinny.
a) Explain how we can use the above apparatus to investigate which of the surfaces absorbs more infrared radiation.
b)
i) Would you expect the ball bearing to fall off of the dark matt surface or the light shiny surface first?
ii) What would your answer to part bi tell us about which surfaces are the best at absorbing infrared radiation?
a) Explain how we can use the above apparatus to investigate which of the surfaces absorbs more infrared radiation.
b)
i) Would you expect the ball bearing to fall off of the dark matt surface or the light shiny surface first?
ii) What would your answer to part bi tell us about which surfaces are the best at absorbing infrared radiation?