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Frequency and Speed
Frequency counts cycles per second, period is time per cycle, and wave speed follows v = fλ.
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Frequency and Speed
Recommended for Class 10
Frequency and Speed
Frequency is the number of complete oscillations or cycles produced per second.
Its SI unit is:
hertz (Hz)
The time for one complete cycle is the period T.
They are related by:
**f = 1T**
and:
**T = 1f**
Wave Speed
Wave speed is related to frequency and wavelength by:
**v = fλ**
where:
v = speed f = frequency λ = wavelength
Worked Example
f = 5 Hz λ = 2 m
v = fλ
v = 5 × 2
**v = 10 m/s**
Frequency and Speed — Advanced
Common Mistakes
Common Mistakes
- Mistake
Frequency is not speed.
- Mistake
Wavelength is not amplitude.
- Mistake
When a wave enters another medium, frequency usually stays the same while speed and wavelength may change.
Revision Zone
60-Second Revision
Quick cues from this topic — use them for last-minute revision.
f = cycles/s
T = time/cycle
v = fλ
- Definition
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Practice
PQ
Q1. Define frequency.
PQ
Q2. Define period.
PQ
Q3. Derive reciprocal.
PQ
Q4. Use v=fλ.
PQ
Q5. Explain medium crossing.
Exam Practice
EQ
Q1. Define frequency.
EQ
Q2. Define period.
EQ
Q3. State v=fλ.
EQ
Q4. Calculate v when f=5 Hz and λ=2 m.
EQ
Q5. Explain medium crossing.
School-standard facts for Matric and Intermediate. Original explanations — not copied from textbooks.