1) A wave whose wavelength is 0.30 m travels along a 300 m long wire with a total mass of 15 kg. if the wire is subjected to a voltage of 1000 N. What is the speed and frequency of this wave Answer : A. The speed is 471 m / s and the frequency is 140 Hz B. the speed is 141 m / s and the frequency is 470 Hz C. the speed is 270 m / s and the frequency is 241 Hz D. the speed is 240 m / s and the frequency is 171 Hz
MCQs
1) A wave whose wavelength is 0.30 m travels along a 300 m long wire with a total mass of 15 kg. if the wire is subjected to a voltage of 1000 N. What is the speed and frequency of this wave
Answer :
A. The speed is 471 m / s and the frequency is 140 Hz
B. the speed is 141 m / s and the frequency is 470 Hz
C. the speed is 270 m / s and the frequency is 241 Hz
D. the speed is 240 m / s and the frequency is 171 Hz
2) A small insect with a mass of 0.30 g is trapped in the spider's nest which causes the spider's web to be compressed as deep as 2 cm. If the insect causes the cobweb to vibrate at a speed of 0.4 m / s. Determine the energy size of the little insect.
Answer
A. 3.70 x 10 ̂ -5 Nm
B. 4.20 x 10 ̂ -5 Nm
C. 6.30 x 10 ̂ -5 Nm
D. 5.40 x 10 ̂ -5 Nm
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