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MERGED ACTUAL OCR 2024 OCR A Level PHYSICS A May-June 2024 Question Paper 3 WITH MARK SCHEME £5.31
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MERGED ACTUAL OCR 2024 OCR A Level PHYSICS A May-June 2024 Question Paper 3 WITH MARK SCHEME

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MERGED ACTUAL OCR 2024 OCR A Level PHYSICS A May-June 2024 Question Paper 3 WITH MARK SCHEME

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  • December 15, 2024
  • 51
  • 2024/2025
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Mathsdude7
JUNE 2024
OCR
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, 2
Answer all the questions.

1 A flute is a musical instrument made from a long tube that is open at both ends.

A stationary sound wave in the tube produces a musical note.

The lowest frequency note that a standard flute produces in air is 262 Hz.

The speed of sound in air at a temperature of 20 °C is 340 m s–1.

(a) Show that a standard flute has an approximate length of 0.65 m.




[3]

(b) In an ideal gas, the speed v of sound is given by
⎛γRT⎞1/2
v=⎝ M ⎠

where

γ is a dimensionless constant that depends on the gas

R is the molar gas constant

T is the absolute temperature

M is the molar mass of the gas.

The table below shows values of γ and M for both air and helium.

Gas M / g mol–1

Air 1.40 29.0

Helium 1.67 4.00




© OCR 2024

, 3
(i) The kinetic model of an ideal gas assumes that there are a large number of particles in rapid,
random motion.

State two further assumptions for the kinetic model of an ideal gas.

1 .......................................................................................................................................................

..........................................................................................................................................................

2 .......................................................................................................................................................

.................................................................................................................................................... [2]

(ii) A standard flute is placed inside a sealed chamber.

The chamber is filled with helium at a temperature of –10 °C.

Calculate the lowest frequency that the flute could produce inside the chamber.




frequency = ................................................... Hz [4]




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