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# 5. Sound

#### Relation Between Wave Velocity, Frequency, and Wave Length for a Periodic Wave

or ...(1)
since equation (1) can also be written as
v = ν λ ...(2)
Wave Velocity = Frequency × Wave Length

Example : 1
If 50 waves are produced in 2 seconds, what is its frequency ?
Solution. Frequency,

= 50/2 = 25 Hz
Example : 2
A source produce 50 crests and 50 troughs in 0.5 second. Find the frequency.
Solution. 1 crest and 1 trough = 1 wave
∴ 50 crests and 50 troughs = 50 waves
Now, Frequency,

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#### NTSE Physics (Class X)

• Electricity
• Magnetic Effect of Curent
• Light Reflection
• Light Refraction
• Human Eye & Colourful World
• Source of Energy
• Motion

#### NTSE Physics (Class IX)

• Force & laws of motion
• Work and Energy
• Gravitation
• Sound

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