Question

Find the wavelength of sound for frequency 1200 khz

Answer 1

if sound travel in air then wavelength will be 344÷1200

Answer 2

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♦ Before solving we must know .

• What is wavelength ?

→ The distance between two Trough or Crest is called wavelength of given wave .

• What is frequency ?

→ The rate of occurrence of wave in one sec .

>> Frequency = $\dfrac{1}{Time\: Period}$


♦ Given that

Frequency :- 1200 kHz

= 1200 × 1000 Hz

= 1200000 Hz

Wave type :- Sound wave

♦ So speed of sound waves is not provided we will take it as 340 m/s

♦ Then as

wavelength = Speed of wave ÷ Frequency

→ $\lambda = \dfrac{c}{f}$

→ $\lambda = \dfrac{340}{1200000}$

→ $\lambda = \dfrac{2.83}{10000}$

→ $\lambda = 2.83 \times 10^{-4}$

♦ So wavelength = $2.83 \times 10^{-4}$ m .