| Text | Nuclear fission happens when a {{c1::slow-moving}} neutron hits a radioactive nucleus. |
| Extra | |
| Extra-back | |
| Tags | Physics::5(radioactivity_and_nuclear_energy) wait_but_why |
| Front | Why do materials in nano scale exhibit different properties? |
| Back | 1. surface area effect2. quantum effect |
| mark(optional) | |
| Tags | Physics::E2(atomic_world) |
| Front | Advantages and disadvantages of fossil-fuel vehicles? |
| Back | Advantages: short refuelling timelong rangelow selling priceDisadvantages:emits greenhouse gases and air pollutantslow end-use energy efficiency (ie higher fuel cost) |
| mark(optional) | |
| Tags | Physics::E3(energy_and_use_of_energy) |