Physics Jeopardy

Physics Jeopardy Waves Waves Sound Wave Calc Extra credit on quiz questions Q $100 Q $100 Q $100 Q $100 Q $100 Q $200 Q $200 Q $200 Q $200 Q $200 Q $300 Q $300 Q $300 Q $300 Q $300 Q $400 Q $400 Q $400 Q $400 Q $400 Q $500 Q $500 Q $500 Q $500 Q $500 Final Jeopardy

$100 Waves • Where can you touch a standing wave on a rope without disturbing the wave?

$100 Answer Waves • At any of the nodes

$200 Waves • As the sound of a car’s horn passes and recedes from you, the pitch of the horn seems to _______.

$200 Answer Waves • Decrease

0.5 s 1 m 3 m $300 Waves • The Frequency of this wave is _________.

$300 Answer Waves • 2 Hz

$400 Waves • What is a sonic boom?

$400 Answer Waves • A 3D wave pattern that is produced as the source of a wave moves faster than the wave it produces.

$500 Waves Suppose a simple pendulum is suspended in an elevator. When the elevator is accelerating upward, the period of the pendulum __________.

$500 Answer Waves • Decreases

0.5 s 1 m 3 m $100 Question Waves • The amplitude of this wave is _________.

$100 Answer Waves 1 m

$200 Question Waves During a single period of a wave, how far does it travel?

$200 Answer Waves One wavelength

$300 Question Waves As the speed of a wave in air changes, its frequency will _______.

$300 Answer Waves It shouldn’t do anything. As frequency changes wavelength changes, but the speed of a wave in a medium is constant.

$400 Question Waves What does it mean for two waves to be 180 degrees out of phase? What happens to these two waves?

$400 Answer Waves They cancel out

$500 Question Waves I drop an elephant off a boat in the middle of the Atlantic ocean. Explain why, if energy is conserved, why the wave most likely wont reach you in cape cod?

$500 Answer Waves The energy spreads out

0.5 s 1 m 3 m $100 Question Wave Calc. The wave speed of this wave is _________.

$100 Answer Wave Calc. 6 m/s

$200 Question Wave Calc. If you double the frequency of a vibrating object, its period __________.

$200 Answer Wave Calc. halves

$300 Question Wave Calc. Katie pushes Micah on a swing in an attempt knock Forrest over on the other side of the swing set. If it takes Micah 1.4s to hit Forrest, how long is the swing?

$300 Answer Wave Calc. .69 m

$400 Question Wave Calc. Radio amateurs are permitted to communicate on the 10 meter band. What frequency of radio waves corresponds to a wavelength of 10m if the speed of light is 3x108m/s?

$400 Answer Wave Calc. 3x10^7 Hz

$500 Question Wave Calc. As an anchor is being hoisted out of the water, it hits the hull of a ship, causing the anchor to vibrate with a frequency of 150 Hz. If the speed of sound in sea water is 1520 m/s, how many wavelengths of sound will fit between the boat and the ocean bottom 395 m below?

$500 Answer Wave Calc. 38.98 m

$100 Question Sound A sound wave is what kind of wave?

$100 Answer Sound Longitudinal or compression

$200 Question Sound What is the resonant frequency of a 350 Hz tuning fork if it is struck on a 25 degree Celsius day?

$200 Answer Sound 350 Hz

$300 Question Sound How many times more intense is a 80 dB sound than a 60 dB sound?

$300 Answer Sound 100 times

$400 Question Sound Laura is going to drop a pie on your head from a high altitude. To stop you from getting pied, Jack tries to sabotage Laura by placing a buzzer in the pie. The buzzer creates a tone of about 19,700 Hz. Do you think you will get hit with the pie? Why?

$400 Answer Sound Yes, since the pie is traveling toward you, the frequency increases due to the Doppler Effect. A human can’t hear over 20,000 Hz and has trouble even with frequencies approaching that so most likely you wont hear it coming.

$500 Question Sound Two notes are sounding, one of which is 370 Hz. If a beat frequency of 5 Hz is heard, what is the other note’s Frequency?

$500 Answer Sound 365 Hz, or 375 Hz

$100 Question Other Draw a picture of the second harmonic on a string of length 2 meters

$100 Answer Other 2m

$200 Question Other What direction will point E move as this wave progresses?

$200 Answer Other Downward

$300 Question Other A whale makes a bellowing sound that is with in the subsonic frequency. This means that it is below what frequency of sound?

$300 Answer Other 20 Hz

$400 Question Other Draw the third harmonic of a wave that fits into a flute (two open ends) that has a length of .3 m. Draw this wave and record the wavelength.

$400 Answer Other .2m

$500 Question Other A torpedo fired from a submerged submarine is propelled through the water with a speed of 20.0m/s and explodes upon impact with a target 2000m away. If the sound of the impact is heard 101.4 s after the torpedo was fired,what is the speed of sound in water ? ( Because the torpedo is held at a constant speed by its propeller, the effect of the water resistance can be neglected.)

Physics Jeopardy