Maharashtra State PSC Model Paper 1

The correct answer is 0.45 m.

• 0.45 m is the wavelength of a sound wave in a medium with a frequency of 840 Hz and a speed of 380 m/s seconds.
• Speed of the sound wave, v = 380 ms^-1
• For a sound wave,
  • Speed = Wavelength x Frequency
  • wavelength = speed / frequency
    • wavelength = 380 / 840
    • wavelength = 0.45 m
• Hence, the wavelength of the sound wave is 0.45 m.
• Hence, option 3 is correct.