Q: 33 (NDA-I/2022)
question_subject:
Science
question_exam:
NDA-I
stats:
0,16,30,15,10,5,16
keywords:
{'frequency': [0, 0, 1, 3], 'wavelength': [0, 0, 3, 3], 'sound wave': [0, 0, 0, 5]}
The correct answer is option 2: 4 seconds.
To determine the time it takes for the sound wave to travel 1 km, we need to use the formula:
Speed = Frequency x Wavelength
Given that the frequency is 1 kHz (1,000 Hz) and the wavelength is 50 cm (0.5 m), we can plug these values into the formula:
Speed = 1000 Hz x 0.5 m = 500 m/s
Now, to calculate the time it takes to travel 1 km, we divide the distance by the speed:
Time = Distance / Speed = 1000 m / 500 m/s = 2 seconds
Therefore, it will take 2 seconds for the sound wave to travel 1 km.
Alert - correct answer should be option 4: 2 seconds