Qualification > Sciences
ALL CIE PHYSICS DOUBTS HERE !!!
astarmathsandphysics:
She is right but you can do questions from book instead of past papers
ashwinkandel:
Hello Sir(astarmathsandphysics) As per the previous question for ii) one is more spread out than the other. The spectrum on the left is brighter than the one on the right. Can you explain me the reason why one is more spread and brighter.
astarmathsandphysics:
yes.The spectrum forms an envelope like in a double slit.
within each bright spot the cours spread out tp form a rainbow which is why you get different coloured fringes.
Neaer the edges, since we are projecting onto a flat surface, the image spreads out.
ashwinkandel:
Question from Radioactivity:
Q.Approximate values for the radius of a gold atom and the radius of a gold nucleus are 10^-10 m and 10^-15 m respectively.
a. Estimate the ratio of volume of a gold atom to the volume of a gold nucleus. [2]
b. The density of gold is 19000 kg/m^3. Estimate the density of a gold nucleus stating any assumptions that you make in your answers.[3]
ashwinkandel:
Help needed immediately for this question and above posted question as my Physics Paper 2 is on 16th Nov.
Questions from States of Matter:
1.
a. Explain how a manometer may be adapted to measure large pressures.
b. Explain why the pressure measured by manometer does not depend on the cross-sectional area of the tube used in the manometer.
2. A boy stands on a platform of area 0.050 m^2 and a manometer measures the pressure created in a flexible plastic container by the weight W of the boy. The density of water is 1000 kg/m^3/ Determine
i. the pressure difference between the inside of the plastic container and the atmosphere outside. [2]
ii. the weight W of the boy. [2]
3.The diagram shows a U-tube, open at both ends, which contains two different liquids X and Y that do not mix. The numbers on the metre rule are distances in centimetres. The density of liquid Y is 800 kg/m^3
i.Explain how diagram shows that liquid Y has a greater density than liquid X [2]
ii. Calculate the density of X. [3]
iii. Explain why the pressure in the U-tube is the same on the both sides of the manometer at the level L. [1]
iv. Calculate the pressure caused by liquid in the U-tube at level L. [2]
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