Welcome to your General Waves - Types and Properties(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. What are the essential properties a medium must possess for the propagation of mechanical waves Constant temperature Stable pressure Minimum friction Maximum friction2. What is the most fundamental property of wave? wavelength frequency temperatue pressure3. Two waves of wavelength 99cm and 100cm both travelling with velocity 396m/s are made to interfere. The number of beats produced by them per second is? 2 4 8 14. In a transverse wave, the distance between two adjacent crests is the wavelength twice the wavelength one quarter of the wave length half of the wave length5. Two waves are propagating with the same amplitude and nearly same frequency in opposite direction, they result in ___ Stationary wave Resonance Beats Wave packet6. In which medium sound travels faster? Liquid Water vapour Gas Solid7. Mechanical waves are called elastic waves. True False8. The source of sound generating of a frequency of 3 kHz reaches an observer with a speed of 0.5 times the velocity of sound in air. The frequency heard by the observer is? 1kHz 6 kHz 4 kHz 3 kHz9. Two trains, each moving with a velocity of 30m/s, cross each other. One of the trains gives a whistle whose frequency is 600Hz. If the speed of sound is 330m/s, the apparent frequency for passengers sitting in the other train before crossing would be __________ 600Hz 630Hz 720Hz 930Hz10. The phenomenon by which stars recede from each other is explained by __________ Black hole theory Neutron star theory White dwarf Red shift11. An organ pipe, open at both ends produce 5 beats per second when vibrated with a source of frequency 200Hz. The second harmonic of the same pipe produces 10 beats per second with a source of frequency 420 Hz. The frequency of source is? 195Hz 205Hz 190Hz 210Hz12. Which of the following is not true about waves? electromagnetic waves have the same velocity in the same medium particles of a medium vibrate if there is a wave motion in tte medium waves transfer energy from one place to another all waves require a material medium for their propagation13. The material that a wave travels through is called the Amplitude Compression Medium Rarefaction14. For an aluminium the modulus of rigidity is 2.1×1010 N/m2 and density is 2.7×103 kg/m3. Find the speed of transverse waves in the medium. 25.14×10³ m/s 2.79×10³ m/s 27.9×10³ m/s 24.1×10³ m/s15. A person is standing on a railway platform and a train is approaching to him, what is maximum wavelength of sound he can hear? Wavelength of whistle=1m, speed of sound in air=330m/s, speed of train=36km/h. 33/32m 32/322m 12/13m 1m16. If a light wave has a wave length of 500 nm in air, what is the frequency of the wave? 6.0 e14 Hz 6.0 e12 Hz 3.0 e14 Hz 2.5 e14 Hz17. Speed of recession of a galaxy is proportional to its distance _____ Inversely Directly Linearly Exponentially18. By counting the number of crests that pass in a given amount of time, a person can calculate the Amplitude Wavelength Frequency Velocity19. A racing car moving towards a cliff sound its horn. The driver observes that the sound reflected from the cliff has a pitch one octave higher than the actual sound of the horn. If v is the velocity of sound, the velocity of the car is? v/√2 v/3 v/2 v/420. A train is approaching with velocity 25m/s towards a pedestrian standing on the track, frequency of horn of train is 1 kHz. Frequency heard by the pedestrian is (v=350m/s). 985Hz 1077Hz 1167Hz 945Hz21. In the animation shown, at the point where the two waves cross, which property changes? Amplitude Index of refraction Frequency Speed22. A source emits a sound of a frequency of 400Hz, but the listener hears it’s to be 390Hz. Then? The source is moving towards the listener The listener has a defective ear The listener is moving towards the source The listener is moving away from the source23. A wave frequency of 2Hz and a wavelength of 30 cm. The velocity of the wave is 0.6 ms 6.0 m/s 60.0 m/s 1.5 m/s24. The period of vibration of a wave of wavelength 30 m moving at a speed of 300 m/s is 0.1 s 270 s 10 s 330 s25. The loudness and pitch of a sound note depends on __________ Intensity and velocity Intensity and frequency Frequency and number of harmonics Frequency and velocity26 out of 25Time is Up!