PHYSICS 2021
Oxford Cambridge and RSA
Thursday 14 October 2021 – Morning
AS Level Physics A
H156/02 Depth in physics
Time allowed: 1 hour 30 minutes
You must have:
* 8 3 2 4 2 9 4 2 2 4 *
• the Data, Formulae and Relationships Booklet
You can use:
• a scientific or graphical calculator
• a ruler (cm/mm)
* H 1 5 6 0 2 *
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined pages at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 20 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2021 [601/4742/8] OCR is an exempt Charity
DC (ST/CT) 300869/4 Turn over
, 2
Answer all the questions.
1 Two loudspeakers S1 and S2 are connected to a signal generator. The loudspeakers emit coherent
sound waves.
(a) State what is meant by the term coherent.
...................................................................................................................................................
.............................................................................................................................................. [1]
(b) A microphone is connected to an oscilloscope. The points O, J, K and L all lie on a straight
line as shown. The microphone is moved from O to L.
L
K
J
S1
O
S2
Not to scale
A series of maxima and minima is observed between O and L.
The microphone records a maximum at O. As it moves towards L, the first minimum is
observed at J and the next maximum at K.
The distance between S1 and J is 2.00 m and the distance between S2 and J is 2.08 m.
The distance between S1 and K is 2.05 m and the distance between S2 and K is 2.21 m.
(i) Calculate the path difference at point J between the waves from S1 and S2.
path difference = ..................................................... m [1]
(ii) State the phase difference in radian at point J between the waves from S1 and S2.
phase difference = ................................................... rad [1]
© OCR 2021
, 3
(iii) Show that the wavelength of the sound waves is 0.16 m.
[1]
(c) The frequency of the sound is determined using the oscilloscope.
(i) Explain how the oscilloscope is used to determine the frequency.
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [2]
(ii) The frequency of the sound is 2.1 kHz.
Determine the speed v of sound.
v = ................................................ m s−1 [2]
© OCR 2021 Turn over
Oxford Cambridge and RSA
Thursday 14 October 2021 – Morning
AS Level Physics A
H156/02 Depth in physics
Time allowed: 1 hour 30 minutes
You must have:
* 8 3 2 4 2 9 4 2 2 4 *
• the Data, Formulae and Relationships Booklet
You can use:
• a scientific or graphical calculator
• a ruler (cm/mm)
* H 1 5 6 0 2 *
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined pages at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 20 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2021 [601/4742/8] OCR is an exempt Charity
DC (ST/CT) 300869/4 Turn over
, 2
Answer all the questions.
1 Two loudspeakers S1 and S2 are connected to a signal generator. The loudspeakers emit coherent
sound waves.
(a) State what is meant by the term coherent.
...................................................................................................................................................
.............................................................................................................................................. [1]
(b) A microphone is connected to an oscilloscope. The points O, J, K and L all lie on a straight
line as shown. The microphone is moved from O to L.
L
K
J
S1
O
S2
Not to scale
A series of maxima and minima is observed between O and L.
The microphone records a maximum at O. As it moves towards L, the first minimum is
observed at J and the next maximum at K.
The distance between S1 and J is 2.00 m and the distance between S2 and J is 2.08 m.
The distance between S1 and K is 2.05 m and the distance between S2 and K is 2.21 m.
(i) Calculate the path difference at point J between the waves from S1 and S2.
path difference = ..................................................... m [1]
(ii) State the phase difference in radian at point J between the waves from S1 and S2.
phase difference = ................................................... rad [1]
© OCR 2021
, 3
(iii) Show that the wavelength of the sound waves is 0.16 m.
[1]
(c) The frequency of the sound is determined using the oscilloscope.
(i) Explain how the oscilloscope is used to determine the frequency.
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [2]
(ii) The frequency of the sound is 2.1 kHz.
Determine the speed v of sound.
v = ................................................ m s−1 [2]
© OCR 2021 Turn over
