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  1. D

    Biology; Chemistry; Physics: Post your doubts here!

    The normals are in red and the rays are in green. For Ray 2 the angle of incidence and reflection must match what is given in the question. I've just drawn an estimate.
  2. D

    Biology; Chemistry; Physics: Post your doubts here!

    Calculate the gradient of the straight line.
  3. D

    Biology; Chemistry; Physics: Post your doubts here!

    IIRC it is mentioned in the question that P and Q are the ends of the spectrum. Red is always at the upper end.
  4. D

    Biology; Chemistry; Physics: Post your doubts here!

    Yes
  5. D

    Biology; Chemistry; Physics: Post your doubts here!

    Calculate the gradient of the straight line and it will give the constant speed (terminal velocity).
  6. D

    Biology; Chemistry; Physics: Post your doubts here!

    When the resistance of R increases, the effective resistance of the 2 resistors in parallel also increases. This means that voltage V2 across the parallel resistors increases. Since this is a potential divider, the other voltage, V1 decreases (the total voltage in the circuit is constant.)
  7. D

    Biology; Chemistry; Physics: Post your doubts here!

    Find the number of half lives it will take to get to 90 counts/s then multiply that by the time (2400 years)
  8. D

    Biology; Chemistry; Physics: Post your doubts here!

    Because it's milli second. And in part b, the pattern of both waves repeat after every 4 squares.
  9. D

    Biology; Chemistry; Physics: Post your doubts here!

    Time Period = 0.2 * 10^-3 * 4 = 0.0008 Frequency = 1 /0.0008 = 1250 Hz
  10. D

    Biology; Chemistry; Physics: Post your doubts here!

    Resistance would have been the gradient if Voltage was on Y and Current was on X. Since it's the opposite, the resistance is the inverse of the gradient.
  11. D

    Biology; Chemistry; Physics: Post your doubts here!

    Need explanation for this one.
  12. D

    Biology; Chemistry; Physics: Post your doubts here!

    When are bio p1/p2? Just wondering.
  13. D

    Biology; Chemistry; Physics: Post your doubts here!

    First one is test for Fe+2 ion and the second is test for nitrate ion. So you join the 2 together and answer is C.
  14. D

    HI FREINDS HOW WAS THE PHYSICS ATP GCSE O LAVEL?

    That's right I think but why is the zero mark in the middle of nowhere? It should be at the top or bottom of the rule.
  15. D

    HI FREINDS HOW WAS THE PHYSICS ATP GCSE O LAVEL?

    That would give the height of water under the rod.
  16. D

    HI FREINDS HOW WAS THE PHYSICS ATP GCSE O LAVEL?

    You don't write refractive index as X:Z... Furthermore, in the past papers, whenever it says "to appropriate number of significant figures", the answer is always a decimal number.
  17. D

    how was the physics atp 5054/42 may/june 2014

    We shouldn't discuss it like that before 24 hours or we're gonna get banned lel.
  18. D

    how was the physics atp 5054/42 may/june 2014

    Paper was very easy but I gave the volume 1.98 in the last question instead of 2.0...
  19. D

    Biology; Chemistry; Physics: Post your doubts here!

    Just draw a circuit with an ammeter and rheostat.
  20. D

    Biology; Chemistry; Physics: Post your doubts here!

    Because at the start you do not know what the magnitude is. For all you know, it could be greater than 5V. So you use a large range first to get an idea of the magnitude, then use the voltmeter of the appropriate range to get maximum accuracy.
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