FORMULAE
You may find the following formulae useful.
energy transferred = current×voltage×time E = I×V×t
frequency = 1
time period
f = 1
T
power =
work done
time taken P = Wt
power =
energy transferred
time t
...
FORMULAE
You may find the following formulae useful.
energy transferred = current×voltage×time E = I×V×t
frequency = 1
time period
f = 1
T
power =
work done
time taken P = Wt
power =
energy transferred
time taken
P = W
t
orbital speed = 2 orbital radius
time period
π ×
v =
2 r
π T
× ×
(final speed)2 = (initial speed)2 + (2×acceleration×distance moved)
v2 = u2 + (2×a×s)
pressure×volume = constant p1×V1 = p2×V2
pressure
temperature
= constant
p T
p T
1 1
2 2
=
force = change in momentum
time taken
F = ( ) mv mu
− t
change of wavelength
wavelength
velocity of a galaxy
speed o
=
f light
− Δ
= =
0
0 0
v c
λ λ λ
λ λ
change in thermal energy = mass×specific heat capacity×change in temperature
ΔQ = m×c×ΔT
Where necessary, assume the acceleration of free fall, g = 10 m/s2.*P68388A0324* Turn over 3
BLANK PAGE4 *P68388A0424*
Answer ALL questions.
1 The photograph shows a security camera.
The camera detects light waves and sound waves.
(a) State two differences between light waves and sound waves.
(2)
1 ...............................................................................................................................................................................................................................................................................
....................................................................................................................................................................................................................................................................................
2 ...............................................................................................................................................................................................................................................................................
....................................................................................................................................................................................................................................................................................
(b) The camera detects infrared waves, which allow the camera to record videos in the dark.
(i) Which of these electromagnetic waves has a longer wavelength than
infrared waves?
(1)
A gamma rays
B microwaves
C ultraviolet rays
D visible light waves*P68388A0524* Turn over 5
(ii) Which of these is another use for infrared waves?
(1)
A fluorescent lamps
B heating lamps
C satellite transmissions
D sterilising medical equipment
(iii) Which of these is a harmful effect of infrared waves?
(1)
A blindness
B cancer
C internal heating of body tissue
D skin burns
(c) The grid shows the oscilloscope trace for a quiet, low-pitch sound wave.
The security camera has an alarm that produces a loud, high-pitch sound.
On the grid, draw a trace to represent the sound wave produced by the alarm.
(2)
(Total for Question 1 = 7 marks)6 *P68388A0624*
2 The nuclear equation shows how a nucleus of uranium-236 may undergo nuclear fission.
236
92U → 140 54Xe + 94 38Sr + 10n
(a) Determine how many neutrons are released in this fission process.
(1)
number of neutrons = ..............................................................
(b) The table gives some of the constituents of this nuclear fission.
Complete the table by putting one tick (ü) in each row to show whether th
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