امواج

Written by Dr. Hamza Farooq (Physics)

گیارہویں جماعت · طبیعیات · 8 سوالات

نام: ____________________   تاریخ: ____________

1. The speed of a wave of frequency 100 Hz and wavelength 3.4 m is:

   • A 340 m/s
   • B 3.4 m/s
   • C 34 m/s
   • D 103.4 m/s

2. The beat frequency of two sources of 256 Hz and 260 Hz is:

   • A 2 Hz
   • B 4 Hz
   • C 258 Hz
   • D 516 Hz

3. In a stationary wave the points of zero amplitude are:

   • A Wavefronts
   • B Nodes
   • C Crests
   • D Antinodes

4. The Doppler effect is a change in the observed:

   • A Mass
   • B Amplitude only
   • C Frequency due to relative motion
   • D Speed of light

5. The fundamental frequency of a string of length L and wave speed v fixed at both ends is:

   • A 2 v / L
   • B v / 2L
   • C v / L
   • D v L

6. The speed of a wave on a stretched string increases when the tension:

   • A Increases
   • B Is zero
   • C Decreases
   • D Is constant

7. Sound is a:

   • A Transverse wave only
   • B Electromagnetic wave
   • C Surface wave only
   • D Longitudinal wave

8. Constructive interference occurs when two waves meet:

   • A In phase
   • B At right angles
   • C At different speeds
   • D Out of phase by 180 degrees