How long will a sound wave take to travel 1.5km, which…

Question

How long will a sound wave take to travel 1.5km, which has a frequency of 5 kHz and wavelength of 6 cm?

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Question & Answer (English)

How long will a sound wave take to travel 1.5km, which has a frequency of 5 kHz and wavelength of 6 cm?

  1. 25 seconds
  2. 5 seconds — Correct Answer
  3. 50 seconds
  4. 2.5 seconds
Explanation:

Given:

  • Distance to travel ($d$) = $1.5\text{ km} = 1500\text{ m}$
  • Frequency ($f$) = $5\text{ kHz} = 5000\text{ Hz}$
  • Wavelength ($\lambda$) = $6\text{ cm} = 0.06\text{ m}$

Step 1: Calculate the speed of the wave ($v$).

$$v = f \times \lambda$$$$v = 5000 \times 0.06$$$$v = 300\text{ m/s}$$

Step 2: Calculate the time taken ($t$).

$$t = \frac{d}{v}$$$$t = \frac{1500}{300}$$

$t = 5\text{ seconds}$

प्रश्न एवं उत्तर (हिंदी)

एक ध्वनि तरंग को 1.5 km की यात्रा करने में कितना समय लगेगा, जिसकी आवृत्ति (frequency) 5 kHz और तरंगदैर्ध्य (wavelength) 6 cm है?

  1. 25 सेकंड
  2. 5 सेकंड — सही उत्तर
  3. 50 सेकंड
  4. 2.5 सेकंड
स्पष्टीकरण:

चलिए इसे स्टेप-बाय-स्टेप हल करते हैं:

दिया गया है:

  • दूरी ($d$) = $1.5\text{ km}$। इसे मीटर में बदलें: $1500\text{ मीटर}$।
  • आवृत्ति ($f$) = $5\text{ kHz}$। इसे हर्ट्ज़ में बदलें: $5000\text{ Hz}$।
  • तरंगदैर्ध्य ($\lambda$) = $6\text{ cm}$। इसे मीटर में बदलें: $0.06\text{ मीटर}$।

चरण 1: तरंग की गति ($v$) निकालें।
सूत्र होता है: $v = f \times \lambda$

$$v = 5000 \times 0.06 = 300\text{ मीटर/सेकंड}$$

चरण 2: समय ($t$) निकालें।
समय = दूरी / गति

$$t = \frac{1500}{300} = 5\text{ सेकंड}$$

अतः, ध्वनि को पहुंचने में 5 सेकंड लगेंगे।

📚 About this Topic — General Awareness

This multiple choice question is from General Awareness, General Awareness (2024), General Awareness (2024)-3, SSC CGL Tier-1 (PYQs). It has 4 options with a detailed explanation of the correct answer and is available in both English and Hindi (द्विभाषी). Practice more MCQs from General Awareness to strengthen your preparation.

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