Check Test - Waves 2
1 In a longitudinal pulse, particles move ...
a .... in circular paths
... in line with the wave motion.
2 Wavelength and amplitude can be defined for ....
... any repetitive wave.
3 A stretched spring may have ....
... any combination of closed and open boundaries.
4 Transverse waves on a spring reflect from closed and open boundaries so that the reflected wave is...
Closed boundary Open boundary ... out of phase with the incoming wave ... in phase with the incoming wave. ... out of phase with the incoming wave ... out of phase with the incoming wave ... in phase with the incoming wave. ... out of phase with the incoming wave ... in phase with the incoming wave. ... in phase with the incoming wave.
5 The wave equation is normally written as .....
... v = fl
6 When two waves of the same velocity and frequency are superimposed ....
... The amplitude of the combined wave is the sum of the two amplitudes.
7 The frequency of a wave generator with an oscillation period of T seconds is ....
... 1// T _Hz
8 Which of the following statements is correct?
A glass wall in a tank of water normally acts as an open boundary.
9 Waves are shown refracting as they pass from one medium to another. The refractive index of medium 2 with respect to medium 1 is closest to .....
... 2.0
10 Refraction occurs for .....
... for all waves.
11 Which of the following wave motions is longitudinal?
Sound waves.
12 A pulse reflects from a boundary without a phase change and with some loss of energy.
The boundary is .....
... open.
13 A sine wave reflects from a closed boundary with ....
... no phase change.
14 The wave equation is ....
... v = fl
15 The period of a wave generator is 2 seconds.
The frequency is .......
... 0.5 Hz
16 Two transverse water waves of the same wavelength and phase are superimposed. The amplitudes are 2 cm and 4 cm respectively.
The amplitude of the combined waves is ....
... 6 cm.
17 An ocean swell has an amplitude of 2 meters and wavelength of 40 meters.
The equation of the wave is at zero time is ...
... y = 40 sin p x
18 The equation of a traveling wave is normally written as ... y = A sin 2p/l (x - vt)
The equation of another wave, traveling in the same direction, with twice the speed, is....
... . y = A sin 2p/l (x - 2vt)
19 The equation of a traveling wave is written as ... y = A sin 2p/l (x ± vt)
The phase constant is .......
... vt
20 The period of a wave generator with afrequency of T Hertz is ....
... 1// T _s
21 Which of the following completed statements is incorrect?
A standing wave .........
... always has a node at the mid point.
22 A standing wave on the surface of a swimming pool has a period of 4 seconds. The water is flat at zero time.
The water is next flat at ....
... 2 s
23 Which of the following statements is correct?
... Standing waves lose energy at each end.
24 A trumpet has a standing sound wave set up in the
air inside it. The combination of nodes and antinodes at the
ends of the trumpet is normally ....
... a node at the mouth piece end and an antinode at the open end.
25 A bell rings with two frequencies at 430 Hz and 434 Hz. A beat is heard.
The beat frequency is ...
... 4 Hz.
26 The bell in question 15 ...
... is made from two metals.
... is in the form of an inverted cup with a uniform thick rim.
... is old.
... has a thickening on at least one part of the rim.
27 Two sound waves are of almost the same frequency - separated by 0.1 Hz.
The beat period is ....
... 10 s
28 A student is listening to a formula-one commentary from track side on the TV. He notices the pitch of the engine noise reduces suddenly as the cars pass.
The most likely explanation is....
... the Doppler effect.
29 Which of the following waves cannot be polarized?
... ultrasound waves.
30 Polaroid sun-glasses are popular in Canada and Europe.
Why are they seldom seen in Bangkok?
The sun is overhead in the tropics for most of the day.
31 A fisherman notices that ripples expanding from the disturbance when a fish surfaces have longer wavelengths on the outside.
The effect is due to ....
... dispersion.
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