Question bank
Practice A-Level CAIE Physics 7 1 Progressive Waves questions by syllabus topic with past-paper context, marks, difficulty and question previews on Eduninja.
Question 1
The speed v of a transverse wave on a uniform string is given by the expression where T is the tension in the string, l is its length and m is its mass. An experiment is performed to determine the speed v of the wave. The measurements are shown in Table 1.1.
Question 1(a)
Use the data in Table 1.1 to calculate the speed v.
\(v=\left[\left(1.8 \times 126 \times 10^{-2}\right) / 5.1 \times 10^{-3}\right]^{1 / 2}\) C1 \(v=21 \mathrm{~m} \mathrm{~s}^{-1}\) A1
Question 1
Question 1(b)
An electromagnetic wave has frequency 12 THz .
Question 1(b)(i)
Calculate the wavelength in \(\mu \mathrm{m}\). wavelength = \(\mu \mathrm{m}\)
wavelength \(=3 \times 10^{8} / 12 \times 10^{12}\)
Question 2
The diagram shows a cathode-ray oscilloscope (c.r.o.) being used to measure the rate of rotation of a flywheel. The flywheel has a small magnet M mounted on it. Each time the magnet passes the coil, a voltage pulse is generated, which is passed to the c.r.o. The display of the c.r.o. is 10 cm wide. The flywheel is rotating at a rate of about 3000 revolutions per minute. Which time-base setting will display clearly separate pulses on the screen? \(1 \mathrm{scm}^{-1}\) \(10 \mathrm{~ms} \mathrm{~cm}^{-1}\) \(100 \mu \mathrm{~s} \mathrm{~cm}^{-1}\) \(1 \mu \mathrm{scm}^{-1}\)
B
Question 3
The diagram shows a square-wave trace on the screen of a cathode-ray oscilloscope. A grid of 1 cm squares covers the screen. The time-base setting is \(10 \mathrm{~ms} \mathrm{~cm}^{-1}\). What is the approximate frequency of the square wave? 70 Hz 140 Hz 280 Hz 1400 Hz
B
Question 3
A cathode-ray oscilloscope (c.r.o.) is connected to an alternating voltage. The following trace is produced on the screen. The oscilloscope time-base setting is \(0.5 \mathrm{~ms} \mathrm{~cm}^{-1}\) and the Y-plate sensitivity is \(2 \mathrm{~V} \mathrm{~cm}^{-1}\). Which statement about the alternating voltage is correct? The amplitude is 3.5 cm . The frequency is 0.5 kHz . The period is 1 ms . The wavelength is 4 cm .
B
Question 4
A whale produces sound waves of frequency 5 Hz . The waves are detected by a microphone and displayed on an oscilloscope. What is the time-base setting on the oscilloscope? \(0.1 \mathrm{msdiv}^{-1}\) \(1 \mathrm{msdiv}^{-1}\) \(10 \mathrm{msdiv}^{-1}\) \(100 \mathrm{msdiv}^{-1}\)
D
Question 4
A signal that repeats periodically is displayed on the screen of a cathode-ray oscilloscope. The screen has 1 cm squares and the time base is set at \(2.00 \mathrm{~ms} \mathrm{~cm}^{-1}\). What is the frequency of this periodic signal? 50 Hz 100 Hz 125 Hz 200 Hz
B
Question 4
A wave has a frequency of 5 GHz . What is the period of the wave? \(20000 \mu \mathrm{~s}\) 20 ns 2 ns 200 ps
D
Question 4
A signal has a frequency of 2.0 MHz . What is the period of the signal? \(2 \mu \mathrm{~s}\) \(5 \mu \mathrm{~s}\) 200 ns 500 ns
D
Question 5
A cathode-ray oscilloscope displays a square wave, as shown in the diagram. The time-base setting is 0.20 ms per division. What is the frequency of the square wave? 8.3 Hz 830 Hz 1300 Hz 1700 Hz
B