One flutist plays a note of 440Hz while a second flutist plays a note of 442Hz. Which of the following statements is NOT true?
we hear a phenomenon called beats
we hear a single tone whose intensity is modulated twice every second
we can still identify the sound as the tone from flutes
we hear a single tone whose frequency is 2Hz
they play the musical note A.
Which of the followings is NOT true?
a black T-shirt absorbs most of the visible light and reflects little
green plants requires more green light for photosynthesis than other color of light
red glass transmits light at wavelengths near 650nm while absorbing all other wavelengths
blue paint reflects light at wavelengths near 400nm while absorbing all other wavelengths
a colorless glass transmits most of the visible light and absorbs little.
Which of the following statements is NOT true?
an electron’s inherent magnetic moment is called the electron spin
a piece of iron has strong magnetic effects because the atomic magnetic moments are aligned
charged particles will spiral around the magnetic field if they have velocity component parallel to the field direction
the Hall voltage will decrease if the material stays longer in the magnetic field
a moving charged particle creates circular magnetic field around it, perpendicular to its path.
150μF, in series
150μF, in parallel
25μF, in series
25μF, in parallel
impossible to achieve.
Which of the following is NOT true?
a conductor will be completely discharged if it is grounded
a charged rod can attract a neutral wood
a conductor can be charged by contact with a charged plastic rod
a charged rod cannot polarize an insulator
the electrostatic equilibrium means that charges experience zero net force.
A teacher stands indoors, far from an doorway to the playground. The doorway is 0.88m wide. The teacher blows a whistle of frequency 750Hz. Assume that the speed of sound is 343m/s. Ignoring reflections estimate at which angle (measured from the normal of the doorway) it is not possible to hear the whistle clearly on the playground outside the doorway.
51°
11°
71°
1.0°
31°
Which of the following is NOT true?
the blackbody radiation spectrum is continuous
Rutherford’s experiment to shoot high-speed alpha particles through a thin gold foil show that hydrogen spectrum is discrete
Thomson discovered that the cathode ray is made of subatomic particles called electrons
Faraday showed that electrolysis is most easily understood on the basis of an atomic theory of matter
Milikan’s oil-drop measurement showed that there is a fundamental unit of charge.
The space shuttle (of mass m) in a 300-km-high orbit wants to capture a smaller satellite (of mass 0.1m) in the same orbit for repairs. What is the speed ratio of the space shuttle’s to the satellite’s?
10
0.1
1
0.01
100
The motor of a crane uses power P to lift a steel beam. To what value must the motor’s power change to lift the beam twice as high in half the time?
2P
4P
P
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