Question
(a) A sound wave emitted by a vibrator has a frequency of 40000 Hz:
(i) Name the type of wave.
(ii) Give one medical use of the wave mentioned in (1)
(iii) Two aeroplanes A & B moving at speeds 250 m/s and 350 m/
Answers
Answer:
1) longitudinal wave
2) Used in decting brain tumor
3)
(I), Ultrasonic sound
(II). in diagnosis
(III). Frequency of airplane B is greater compare to airplane A.
Explanation:
Given that.
Frequency = 40000 Hz
Speed of A airplane = 250 m/s
Speed of B airplane = 350 m/s
Sound wave :
Sound wave is longitudinal wave.
Sound wave have one characteristics which is known as frequency of sound.
Frequency is number of oscillation per unit time. The unit of frequency is Hertz.
Range of frequency of sound wave is ,
If range of sound frequency is below 20 Hz, it is known as infrasonic sound.
If range of sound frequency is from 20 Hz to 20000 Hz, it is known as sonic sound.
If range of sound frequency is above 20000 Hz, it is known as ultrasonic sound.
(I), Given frequency is above 20000 Hz so, it is ultrasonic sound.
(II). The ultrasonic sound is used in ultrasound test for diagnosis.
(III). Frequency of sound produce by airplane B is high compare to airplane A due to high speed.
Hence, (I), Ultrasonic sound
(II). in diagnosis
(III). Frequency of airplane B is greater compare to airplane A.
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Topic : sound wave
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