Single correct option
Consider the following statements:
1. Ultrasonic waves can be heard by a normal human ear.
2. The speed of sound in air increases with a rise in temperature.
Which of the statements given above is/are correct?
1. Ultrasonic waves can be heard by a normal human ear.
2. The speed of sound in air increases with a rise in temperature.
Which of the statements given above is/are correct?
- A. 1 only
- B. 2 only
- C. Both 1 and 2
- D. Neither 1 nor 2
Show answer and solution
Answer: (B) 2 only
The audible range for humans is about 20 Hz to 20 kHz; ultrasonic waves have frequencies above 20 kHz and cannot be heard, so statement 1 is wrong. The speed of sound in a gas rises with temperature (about 0.6 m/s for every degree Celsius in air), so statement 2 is correct. Hence only statement 2 is correct.
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