A sound wave of frequency of 2 kHz has a wavelength of 35 cm in a given medium. How long will it take to travel a distance of 2⋅1 km through the medium ?
30 s
2⋅1 s
3⋅0 s
4⋅1 s
Answer is Wrong!
Answer is Right!
This question was previously asked in
UPSC CAPF – 2023
– Given $f = 2 \text{ kHz} = 2000 \text{ Hz}$ and $\lambda = 35 \text{ cm} = 0.35 \text{ m}$.
– Speed $v = 2000 \text{ Hz} \times 0.35 \text{ m} = 700 \text{ m/s}$.
– The time ($t$) taken to travel a distance ($d$) is given by $t = d / v$.
– Given $d = 2.1 \text{ km} = 2100 \text{ m}$.
– Time $t = 2100 \text{ m} / 700 \text{ m/s} = 3 \text{ seconds}$.