14.1 Sound + Beats

What is the SPEED of sound in air that is at a temperature of 20^o C?

• 347 m/s

• 351 m/s

• 343 m/s

• 360 m/s

Tags

NGSS.MS-PS4-1

NGSS.MS-PS3-4

Sitting in the bleachers of a high school football game. You are sitting about 130 meters from the far end zone where a big hit occurs. How much time does it take for you to HEAR the sound of the collision? *Assume the air temperature is 20^oC. v = d / t

• 0.71 seconds

• 0.52 seconds

• 0.38 seconds

• 0.24 seconds

You are asked to measure the distance of a long hallway by using a sound wave. The hallway temperature is 20^oC and the ECHO time is 0.68 seconds. What is the distance of the hallway?

(speed = distance / time)

• 89 meters

• 104 meters

• 117 meters

• 128 meters

Tags

NGSS.HS-PS4-1

Lightning strikes off in the distance and you hear a rumble of thunder 12 seconds after. What is the distance the approaching storm is based on the provided information?

• 4 km; 2.4 miles

• 12 km; 4.2 miles

• 2 km; 1.2 miles

• There is no way to determine distance in this situation

Tags

NGSS.HS-PS4-1

(*2 Parts) The arrows at the top AND bottom of the picture illustrate WHAT CONCEPT? *Look carefully and use your words!

• High pressure;

  Low pressure

• Squeezing air;

  Expanding air

• Compressions;

  Rarefactions

• All answers

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

Graphing a longitudinal wave, we associate which of the following?

• Compressions of air to crests on the graph

• Rarefactions in air to troughs on the graph

• Alternating 'squeezing' + 'stretching' of air to sine graph relationships

• Wavelengths related to compressed + stretched air

• All answers

Tags

NGSS.HS-PS4-1

Speed of sound in ‘materials’: There are 3 TRUE/CORRECT statements. There is one that is not true, find it. Which of the following statements is INCORRECT?

• Sound travels faster in warmer air than colder air

• The more 'compressible' the material, the slower a sound wave will travel through it

• The 'harder' the material, the faster a longitudinal wave will travel through it

• Sound waves can only travel through gases (example: air)

Tags

NGSS.HS-PS4-1

Based on the picture, WHICH sound would have the greatest pitch?

• Top picture

• Middle picture

• Bottom picture

• There is no way to determine

Tags

NGSS.HS-PS4-1

Based on what you've learned about Human Hearing: Which of the following is TRUE?

• Human Hearing ranges from 20 Hz to 20,000 Hz

• The lower end of hearing increases as one ages

• The upper end of hearing decreases as one ages

• The range of hearing changes over a lifetime

• All answers are true

The TOP picture illustrates the Beat Pattern of two frequencies played simultaneously. IF the frequencies DIFFER by 5 Hertz, how many beats do you hear in 1 second?

• 0.2 Beats

• 2.5 Beats

• 5 Beats

• 10 Beats

Tags

NGSS.HS-PS4-1