A periodic wave has frequency 71 Hz and wavelength 5 m. Find its speed in m/s.
Answer and explanation
355 m/s
71 × 5 = 355
Subjects
Waves & sound
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Sample exercises
A repeating signal has frequency 116 Hz. Find its period in seconds as a fraction.
Answer and explanation
1/116 s
T = 1/116 s
A periodic wave has frequency 29 Hz and wavelength 13 m. Find its speed in m/s.
Answer and explanation
377 m/s
29 × 13 = 377
Study notes
Wave speed
Frequency is cycles per second; wavelength is the distance per cycle.
Grades 8–12Frequency and period
Period is the time for one complete cycle.
Grades 9–12Waves & sound · Formula sheet
Rules, conditions and small examples in one printable reference.
Grades 8–8Waves & sound · Formula sheet
Rules, conditions and small examples in one printable reference.
Grades 9–10Waves & sound · Formula sheet
Rules, conditions and small examples in one printable reference.
Grades 11–12