Oxford Revise AQA GCSE Combined Science Foundation | Chapter P11 answers
P11: Waves
| Question | Answers | Extra information | Mark | AO / Specification reference |
| 01.1 |
microwaves x-rays |
1 1 |
AO1 6.6.2.1 |
|
| 01.2 | transverse | 1 |
AO1 6.6.2.1 |
|
| 01.3 | energy | 1 |
AO1 6.6.2.1 |
|
| 02.1 | \( \rm{frequency} = \frac{20}{10} \)= 2 (Hz) |
1 1 |
AO2 6.6.1.2 |
|
| 02.2 | \(\rm{wavelength} = \frac{0.3}{20} \)= 0.015 m |
1 1 |
AO2 6.6.1.2 |
|
| 02.3 | speed = frequency × wavelength | 1 |
AO1 6.6.1.2 |
|
| 02.4 |
speed = 2 × 0.015 = 0.03 m/s |
1 1 1 |
AO2 6.6.1.2 |
|
| 03.1 |
radio waves – television microwaves – mobile phones |
1 1 |
AO1 6.6.2.4 |
|
| 03.2 |
x-rays to look at broken bones
|
accept any correct use of medical x-ray imaging |
1 1 |
AO1 6.6.2.4 |
| 03.3 | skin cancer/premature aging of the skin | 1 |
AO1 6.6.2.3 |
|
| 03.4 | sievert | 1 |
AO1 6.6.2.3 |
|
| 04 |
Example answer: both waves are used for imaging our eyes detect visible light x-rays are used to look inside the body x-rays have a higher frequency than visible light x-rays have a shorter wavelength than visible light large doses of visible light can cause blindness smaller doses of X-rays can cause cancer |
accept reverse statements | 6 |
AO3 6.6.2.1 6.6.2.3 |
| 05.1 |
C above a place where the coils are close together R above a place where the coils are far apart |
1 1 |
AO2 6.6.1.1 |
|
| 05.2 |
1.5 m = 3 waves \(\frac{1.5}{3}= 0.5\ \rm{m} \) |
1 1 |
AO2 6.6.1.1 6.6.1.2 |
|
| 05.3 | speed = frequency × wavelength | accept v = fλ or correct rearrangements | 1 |
AO1 6.6.1.2 |
| 05.4 |
1.0 m/s = frequency \(\rm{frequency} =\frac{1.0}{0.5} \) = 2 Hz |
1 1 1 |
AO1 AO2 6.6.1.1 6.6.1.2 |
|
| 05.5 | longitudinal | 1 |
AO1 6.6.1.2 |
|
| 06.1 |
period = the time for one wave in seconds \(\rm{period} =\frac{1}{\rm{frequency}} \) |
1 1 |
AO1 6.6.1.2 |
|
| 06.2 | \(\rm{period} = \frac{1}{500} \)= 0.002 (s) |
1 1 |
AO2 6.6.1.2 |
|
| 06.3 |
500 × 5 = 2500 |
1 1 |
AO2 6.6.1.2 |
|
| 06.4 | m/s | 1 |
AO1 6.6.1.2 |
|
| 07.1 |
visible light has a longer wavelength than ultraviolet radiation visible light has a lower frequency than ultraviolet radiation |
1 1 |
AO2 6.6.2.1 |
|
| 07.2 | (increased risk of) cancer/mutation of genes | 1 |
AO1 6.6.2.3 |
|
| 07.3 |
frequency the higher the frequency, the more energy the waves carry |
1 1 |
AO3 6.6.2.1 |
|
| 08.1 | zero/0 | 1 |
AO2 6.5.4.1.1 |
|
| 08.2 | \(\rm{speed} = \frac{\rm{distance}}{\rm{time}} \) |
1 |
AO1 6.5.4.1.2 |
|
| 08.3 |
distance = 4.5 miles × 1609 = 7240.5 m time = 20 min × 60s = 1200 s \(\rm{speed} =\frac{7240.5}{1200} \) = 6.0 m/s |
1 1 1 1 |
AO1 AO2 6.5.4.1.2 |
|
| 08.4 | the speed varies over the journey/the calculation assumes the speed is constant | 1 |
AO3 6.5.4.1.2 |
|
| 08.5 |
there is a force of friction/air resistance/resultant force is zero Newton’s first law says that an object moves with a steady speed when the resultant force is zero/the forces cancel out |
1 1 1 |
AO3 6.5.4.2.1 |