Wave Basic Concepts - 无忧得胜-网上国际课程 (5edu.win)

1#

94.06: Which of the following statements about thhf+-)8vgw/nc: bvlu1 gob nsu1 0d*xoe speed of waves on a string are trw /+1ns: 1g v n0c)guod8ub-obxlh*vfue?
I. The speed depends on the tension in the string.
II. The speed depends on the frequency.
III. The speed depends on the mass per unit length of the string.

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

97.23: String L and string H have the same tensiopw 14ss8+qfq zzj)9sef8nu .gtaw 02b n and length. String L has mass m and string H has mass 4m. If the speed waves in string L is v, the aw b q fe81zwtp.j420s+8g9zss n q)ufspeed of waves in string H is

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

07.44: A person vibrates the end of a string sending transverse waves down u2suf)6+pzf*y f an-t0pc e qzlq*/bwo /n3l3 the string. If the person then doubles the rate at which+*eo/ s-6upqfnl0tnw33uz)bapf*z /2fy clq he vibrates the string, the speed of the waves

A. doubles and the wavelength is unchanged

B. doubles and the wavelength doubled

C. doubles while the wavelength is halved

D. is unchanged while the wavelength is doubled

E. is unchanged while the wavelength is halved.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

11.23: A string, clamped at both ends, has its tension fixed. A wave generatornc99nn8 aa4 hr vibrates the string with a frnah n8 c994nraequency $f$ producing waves of wavelength $\lambda$ which have speed v. The frequency of the wave generator now is doubled to $2f$. Which one of the following choices best describes the new values of the wavelength of waves produced and the speed of the waves on the string？

A. Wavelength is $0.5\lambda$,Wave Speed is v

B. Wavelength is $0.5\lambda$,Wave Speed is 2v

C. Wavelength is $\lambda$,Wave Speed is 2v

D. Wavelength is $\lambda$,Wave Speed is v

E. Wavelength is $2\lambda$,Wave Speed is 4v

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

95.01： Which is not associated with a sound wa 2qx55 7raspmmve?

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

95.04： A wave has a frequency of 50 Hz. The period of the wave il .s*u+9tauhu s:

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

04.04： A metal bar is vibrating with a frequency of 200 Hz. The period of oscideu.-2 p; wvuillatiou.iw2ude;- v pn would be:

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

01.38: The S-waves (t:yhu;mbq n *6transverse) and P-waves (longitudinal) produced by earthquakes travel at different speeds through the earthqbuyt; nh6:m *. S-waves travel about 4000 m/s, P-waves travel at nearly 7000 m/s, how far away must an earthquake be for the P-waves to arrive 2 minutes before the S-waves?

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

17.07: A traveling sine wa85bcx0qjx+pz.xnk (br me5 (mve of frequency 3.0 Hz is known to move at 6.0 m/s on a string. Which one of the following figures best represents what a one-meter section of the string co xmxp50e ckb5(rm(z8jxb.n q+ uld look like at an instant of time?

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

13.24: Which one of the following statements best descrineepas2c2 ( btay68llntnx; y3 7g0r2bes Huygens’s Principle?ey 2ce7l s2 tx6pbny;nl2aa0n 8rtg3(

A. An additional pressure is transmitted undiminished to all points in the fluid and to the walls of the container.

B. Each point on a wavefront acts as a source of secondary spherical wavelets (new waves).

C. For every action force, there is an equal but opposite reaction force.

D. It is impossible to have a process which has the sole result of transferring energy from a low temperature reservoir to a high temperature reservoir.

E. A time-changing magnetic field has an associated induced electric field.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

02.07: The diagram shows two water pulses which were o*,hum fec5uve1j- 5 tjy u7+bdriginally produced at point A and are beginning to be reflected from a wide barrier as shown.b1dec-jy57t j h+,ef5*mu uuv Which of the points in the diagram would represent a virtual source for the reflected waves?

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

96.03: If the frequency of ,n8 bl45sq13*yey2bsfqocdf -dh ev 4 sound is doubled, the wavelength:

A. halves and the speed remains unchanged.

B. doubles and the speed remains unchanged.

C. is unchanged and the speed doubles.

D. is unchanged and the speed halves.

E. the wavelength halves and the speed halves.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.27: Assume that waves are propagating in a uniform medium. If the freque9v)e,hhxsl1ouz f2a 7 ncy of the wave f2u 7,szh)hlevo1a9x source
doubles then

A. the speed of the waves doubles

B. the wavelength of the waves doubles

C. the speed of the waves halves

D. the wavelength of the waves halves

E. none of the above

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

98.02: An observer hears a sound with frequency 400 Hz. Its wavelengtifd8m bvp2dw+k5 z/ *uh is approximatekwd5uf*p vzim/+ b2d 8ly

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The graph below was produce by a microphone in front of a tuni7-hcblo93 d z (r0 +oxyyt1ybdxvg(f1ng fork. It shows the voltage produced from the microphone as a function ovb ( 9y1yf orgyc7h-( xz13ddlt 0+bxof time.

04.18: The frequency of the tuning fork is (approximately)

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The graph below was produce bvjg7*, y c ggckkt3ab-x5j 6a h)71fmfy a microphone in front of a tuning fork. It shows theg65jamhxc-*gy f tf,b3 kvkcj ga7)17 voltage
produced from the microphone as a function of time.

04.19: In order to calculate the speed of sound from the graph, you would also need to know

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

06.28: A radio signal with a wavel; y 8c 0e)wcq-nmuoefqm:3e9dength of $1.2 × 10^{−4}\:m$ is sent to a distance asteroid, is reflected, and returns to Earth 72 hours and 48 minutes later. How far from Earth is the asteroid?

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

08.46: A traveling wave has the form y = 3.0sin(2.5 x4dn;4pf u l/wd − 5.0 t) where all quantities given are in M/;nuw4 4fddp lKS units, x is position, and t represents time. What is the period of the wave (in seconds)?

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

11.17: A new radio stamx+y,r3u u,2i *vduwttion broadcasts its signal with a wavelength of 3.40 m. At whadw,u3 uiyvu +,r2xt*m t frequency is this station broadcasting?

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