1 #
$T = \frac{1}{f}$
a) 2.0 Hz
frequency = 2.0 Hz
$T = \frac{1}{2.0}$
T = 0.50 s
b) 30 kHz
frequency = 30 kHz = 30,000 Hz
$T = \frac{1}{30,000}$
T = 0.000033 s
c) 25 MHz
frequency = 25 MHz = 25,000,000 Hz
$T = \frac{1}{25,000,000}$
T = 0.00000004 s
d) 4.0 GHz
frequency = 4.0 GHz = 4,000,000,000 Hz
$T = \frac{1}{4,000,000,000}$
T = 0.00000000025 s
2 #
a) the period of oscillation of a particle in the medium transmitting the wave
$v = f\lambda$
speed = 330 m/s
wavelength = 2.4 m
$330 = f \times 2.4$
$f = \frac{330}{2.4} = 137.5 \text{ Hz}$
$T = \frac{1}{f}$
$T = \frac{1}{137.5}$
T = 0.0073 s
b) the frequency of oscillation of the source transmitting the wave
f = 138 Hz
3 #
a) frequency
The number of complete oscillations per second.
b) time period
The time taken for one complete oscillation.
c) wavelength
The distance between two consecutive points that are in phase.
d) wave speed
The distance traveled by a wave per unit time.
4 #
(i) amplitude A
A = 10 mm
(ii) wavelength λ
λ = 8 mm
5 #
(i) amplitude A
A = 10 mm
(ii) time period T
T = 1.0 s
(iii) frequency f
$f = \frac{1}{T}$
T = 1.0 s
$f = \frac{1}{1.0}$
f = 1.0 Hz
