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P6: Quiz 5 – Answers
P6: Quiz 5 – Answers
1) slow down, speed up
Different materials have different densities. When a wave enters a new material, the speed of the wave will change. If the new material is denser than the previous material, the wave will SLOW DOWN. If the new material is less dense than the previous material, the wave will SPEED UP.
2) The normal is an imaginary line that is perpendicular (at 90°) to the second surface
3)
a)
i) Glass is denser than air (or air is less dense than glass)
ii) The wave will travel at a greater speed through air
b)
Different materials have different densities. When a wave enters a new material, the speed of the wave will change. If the new material is denser than the previous material, the wave will SLOW DOWN. If the new material is less dense than the previous material, the wave will SPEED UP.
2) The normal is an imaginary line that is perpendicular (at 90°) to the second surface
3)
a)
i) Glass is denser than air (or air is less dense than glass)
ii) The wave will travel at a greater speed through air
b)
4)
5)
a) V = f λ or wave speed = frequency x wavelength
b) Frequency
c) Wave speed – decrease
Frequency – same
Wavelength – decrease
d) Wave speed – increase
Frequency – same
Wavelength – increase
6)
a) All shown on the diagram below
i) the refracted ray – ray bending towards the normal; orange line in the glass on the diagram below
ii) the angle of incidence – green arc on the diagram below
iii) the angle of refraction – dark blue arc on the diagram below
c) Wave speed – decrease
Frequency – same
Wavelength – decrease
d) Wave speed – increase
Frequency – same
Wavelength – increase
6)
a) All shown on the diagram below
i) the refracted ray – ray bending towards the normal; orange line in the glass on the diagram below
ii) the angle of incidence – green arc on the diagram below
iii) the angle of refraction – dark blue arc on the diagram below
b) All shown on the diagram below
7)
a)
i) Red light (has the longest wavelength)
ii) Violet light (has the shortest wavelength)
iii) Violet light (has the highest frequency)
iv) Red light (has the lowest frequency)
b) Violet light
c) A is red light (as it is refracted the least) and B is violet light (as it is refracted the most)
Questions
1) Fill in the gaps in the paragraph below with “speed up” and “slow down”.
Different materials have different densities. When a wave enters a new material, the speed of the wave will change. If the new material is denser than the previous material, the wave will _______. If the new material is less dense than the previous material, the wave will _______.
2) What is the normal with respect to refraction or reflection?
3) A light ray travels through air into a glass block. The light ray hits the glass block along the normal. The diagram below shows what is happening.
1) Fill in the gaps in the paragraph below with “speed up” and “slow down”.
Different materials have different densities. When a wave enters a new material, the speed of the wave will change. If the new material is denser than the previous material, the wave will _______. If the new material is less dense than the previous material, the wave will _______.
2) What is the normal with respect to refraction or reflection?
3) A light ray travels through air into a glass block. The light ray hits the glass block along the normal. The diagram below shows what is happening.
a)
i) Out of air and glass, which substance is denser?
ii) Out of air and glass, which substance will the wave travel through at a greater speed?
b) Draw the direction of the wave and the lines for the wave travelling through glass on the above diagram.
4) A light ray travels through air into a glass block. The light ray hits the glass block at an angle.
i) Out of air and glass, which substance is denser?
ii) Out of air and glass, which substance will the wave travel through at a greater speed?
b) Draw the direction of the wave and the lines for the wave travelling through glass on the above diagram.
4) A light ray travels through air into a glass block. The light ray hits the glass block at an angle.
Draw the direction of the wave and the lines for the wave travelling through glass on the above diagram.
5)
a) Write down the equation that links wave speed, frequency and wavelength. (you do not need to give the units for the variables)
b) When a light ray enters a new material with a different density, which value out of wave speed, frequency and wavelength remains constant?
c) If a wave enters a denser material, what happens to the values for wave speed, frequency and wavelength; which increase, decrease and stay the same?
d) If a wave enters a less dense material, what happens to the values for wave speed, frequency and wavelength; which increase, decrease and stay the same?
6) We can undertake an experiment to investigate the refraction of light through a glass block. The experiment works by shinning a ray of light towards a glass block at an angle. The diagram below shows the incidence ray heading towards a glass block at an angle. The normal is also shown on the diagram.
5)
a) Write down the equation that links wave speed, frequency and wavelength. (you do not need to give the units for the variables)
b) When a light ray enters a new material with a different density, which value out of wave speed, frequency and wavelength remains constant?
c) If a wave enters a denser material, what happens to the values for wave speed, frequency and wavelength; which increase, decrease and stay the same?
d) If a wave enters a less dense material, what happens to the values for wave speed, frequency and wavelength; which increase, decrease and stay the same?
6) We can undertake an experiment to investigate the refraction of light through a glass block. The experiment works by shinning a ray of light towards a glass block at an angle. The diagram below shows the incidence ray heading towards a glass block at an angle. The normal is also shown on the diagram.
a) For where the incident ray hits the glass block on the left, draw the following:
i) the refracted ray
ii) the angle of incidence
iii) the angle of refraction
b) After the light has been refracted as it enters the glass block, it will travel to the other side of the glass block where it will be refracted again. Draw the second refraction and label the normal, the refracted ray, the angle of incidence and the angle of refraction.
7)
a) White light contains all of the different visible light colours.
i) Out of red light and violet light, which has the longest wavelength?
ii) Out of red light and violet light, which has the shortest wavelength?
iii) Out of red light and violet light, which has the highest frequency?
iv) Out of red light and violet light, which has the lowest frequency?
b) We are now going to shine white light through a triangular glass prism. Out of red and violet light, which will be refracted the most?
c) The diagram below shows the refraction of the different colours within visible light as white light is shone through a triangular glass prism.
i) the refracted ray
ii) the angle of incidence
iii) the angle of refraction
b) After the light has been refracted as it enters the glass block, it will travel to the other side of the glass block where it will be refracted again. Draw the second refraction and label the normal, the refracted ray, the angle of incidence and the angle of refraction.
7)
a) White light contains all of the different visible light colours.
i) Out of red light and violet light, which has the longest wavelength?
ii) Out of red light and violet light, which has the shortest wavelength?
iii) Out of red light and violet light, which has the highest frequency?
iv) Out of red light and violet light, which has the lowest frequency?
b) We are now going to shine white light through a triangular glass prism. Out of red and violet light, which will be refracted the most?
c) The diagram below shows the refraction of the different colours within visible light as white light is shone through a triangular glass prism.
Out of red and violet light, which light will be A and which light will be B?