CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
A wave has frequency 100 Hz and wavelength 0.2 m. Speed is:
A. 19 m/s
B. 20 m/s
C. 21 m/s
D. 22 m/s
CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
A wave has frequency 100 Hz and wavelength 0.1 m. Speed is:
A. 9 m/s
B. 12 m/s
C. 10 m/s
D. 11 m/s
CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
A wave has frequency 50 Hz and wavelength 3 m. Speed is:
A. 150 m/s
B. 152 m/s
C. 149 m/s
D. 151 m/s
CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
A wave has frequency 50 Hz and wavelength 2 m. Speed is:
A. 100 m/s
B. 102 m/s
C. 99 m/s
D. 101 m/s
CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
A wave has frequency 50 Hz and wavelength 1 m. Speed is:
A. 49 m/s
B. 52 m/s
C. 51 m/s
D. 50 m/s
CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
A wave has frequency 50 Hz and wavelength 0.5 m. Speed is:
A. 26 m/s
B. 24 m/s
C. 27 m/s
D. 25 m/s
CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
A wave has frequency 50 Hz and wavelength 0.2 m. Speed is:
A. 11 m/s
B. 10 m/s
C. 12 m/s
D. 9 m/s
CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
A wave has frequency 50 Hz and wavelength 0.1 m. Speed is:
A. 7 m/s
B. 4 m/s
C. 6 m/s
D. 5 m/s
CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
Beat frequency is the:
A. average wavelength
B. product of frequencies
C. sum of frequencies
D. absolute difference between nearby frequencies
Correct Answer: D
fbeat=|f1−f2|.
CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
The decibel scale is commonly used for:
A. sound level
B. wavelength only
C. temperature
D. mass
Correct Answer: A
Sound level is expressed in dB.
CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
Infrasound is below approximately:
A. 200 Hz
B. 20 kHz
C. 20 Hz
D. 2 kHz
Correct Answer: C
Infrasound is below normal hearing range.
CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
Ultrasound is above approximately:
A. 20 Hz
B. 200 Hz
C. 2 kHz
D. 20 kHz
Correct Answer: D
Ultrasound is above human upper hearing limit.
CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
Resonance occurs when driven near a system's:
A. boiling point
B. zero mass
C. natural frequency
D. critical angle
Correct Answer: C
Driving near natural frequency gives large response.
CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
Loudness is strongly related to sound:
A. Intensity/amplitude
B. Wavelength only
C. Color
D. Electric charge
Correct Answer: A
Loudness is related to amplitude/intensity.
CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
Pitch is most directly related to:
A. Frequency
B. Intensity only
C. Amplitude
D. Speed only
Correct Answer: A
Pitch follows frequency.
CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
Sound cannot propagate through a perfect:
A. air column
B. water tank
C. Vacuum
D. steel rod
Correct Answer: C
Sound needs a medium.
CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
Sound in air is primarily a:
A. longitudinal mechanical wave
B. matter wave only
C. static field
D. transverse electromagnetic wave
Correct Answer: A
Sound in air is longitudinal.
CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
Wave speed relation is:
A. v = f/λ
B. v = λ/f
C. v = f+λ
D. v = fλ
CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
Wavelength is distance between successive points in the same:
A. phase
B. density only
C. mass
D. temperature
Correct Answer: A
Wavelength spans equal-phase points.
CSS - PMS - CCE - PCS - Everyday Science
Waves and Sound
Wave frequency is measured in:
A. hertz
B. decibels
C. metres
D. newtons
Correct Answer: A
Frequency unit is hertz.