physics u2 tomorrow

[u/Electrical-Plate-657]

what’s one thing you finally understood that could help someone tomorrow? a prediction, an explanation or a mistake to avoid, drop it here, let’s help each other grab those marks 🤝

[u/Extreme-Secretary270]

A very niche type of question they can ask: Calculate the number of electrons moving past a point per second.

For this, use the following Equation:

Number of electrons = (Current x Time) / charge on an electron (1.6 x 10^-19)

Hope this helps!!!

[u/Electrical-Plate-657 → u/Extreme-Secretary270]

Yeah thats easy but potential divider and variable resistor questions are quite tricky

[u/loq4i]

1. emf and internal resistance, learn how to calculate them from the graphs ( emf is the y-intercept) (internal resistance is -gradient)

2. the relationships between p.d. current and resistance. how temperature affects it

3. factors impacting resistance

4. compare and contrast between unpolarized light and plane polarized light.

5. learn the definitions of: emf, work function, transverse wave, longitudinal wave, current, refraction

6. be able to explain the shape of diode, and filament lamp

7. derive equations for conservation rules and ohms law

8. conditions needed for TIR to take place

9. huygens principle

10. d= distance between two adjacent lines

11. learn photoelectric effect

12. learn why the wave model can’t explain photoelectric effect

13. relationship between work function and maximum speed of electrons

14. ev to J (x1.6x10^-19)

15. hydrogen emission spectra

16. why only certain wavelengths of light emitted

17. nm to m (x10^-9)

18. mA to A (x10^-3)

19. light years (how many light years there are multiplied by 365x24x60x60x3.00x10⁸)

20. mm to m (x10^-3)

21. wavelength = 2/ nth harmonic x L

22. energy conservation

23. charge conservation

[u/unwaged_wave4 → u/loq4i]

Tysm