11th. HS - 24 - Quiz

A sound technician is testing the sound acoustics in a theatre for an upcoming music concert. He sets up speakers in different locations and tests the sound levels in various seats in the theater. In one seat, the sound is twice as loud as it is in other seats in the theater. What wave phenomenon best explains why the sound is louder in one seat compared to others?

• Constructive interference

• Destructive interference

• Decrease in wave frequency

• Increase in wave frequency

A sound technician is testing the sound acoustics in a theatre for an upcoming music concert. He sets up speakers in different locations and tests the sound levels in various seats in the theater. As he moves down the aisles of the theatre, he notices the pitch of the music gets lower. Which description best explains why the pitch gets lower as the technician moves away from the speakers in the theater?

• Constructive interference

• Destructive interference

• Decrease in wave frequency

• Increase in wave frequency

Tags

NGSS.HS-PS4-1

If a transverse wave vibrates up and down three times each second, and the distance between wave crests is 2 meters, what is the speed of the wave?

• 4 m/s

• 6 m/s

• 10 m/s

• 12 m/s

Tags

NGSS.HS-PS4-1

A metal fragment is in a patient. The speed of sound in the tissue is 1450 m/s. The depth of the fragment is 0.265 m. What will be the time between the transducer emitting the sound and picking the sound echo up?

• t = 2.40 E−5 s

• t = 1.23 E−3 s

• t = 1.83 E−6 s

• t = 1.83 E−4 s

Tags

NGSS.HS-PS4-1

The smallest object that can be resolved with a given ultrasound frequency in a diagnostic scanner depends on the wavelength of that ultrasound. If 20.0 E6 Hz ultrasound is used for a scan of the eye and the speed of sound in the tissue is 1500 m/s, what is the smallest detail observable?

• λ = 7.5 E−5 m

• λ = 8.3 E−5 m

• λ = 9.0 E−5 m

• λ = 1.5 E−5 m

Tags

NGSS.HS-PS4-1

A hair dryer draws 10.0 A when plugged into a 120-V line. What is the resistance within the hair dryer? 

• 3 Ω

• 5 Ω

• 8 Ω

• 12 Ω

What is the power rating of an LED light bulb if 0.50 A flow through it when connected to an 18 V battery?

• 3 watts

• 5 watts

• 9 watts

• 13 watts

Two point charges each carrying a charge of + 4.5 E - 6 C are located 4.5 meters away from each other. How strong is the electrostatic force between the two points, and is this force a repulsive force or an attractive force (k = 9.0 E9 Nm²/C²)?

• Fe = 9 E – 3 N

• Fe = 9 E – 5 N

• Fe = 2 E – 3 N

• Fe = 8 E – 3 N

Tags

NGSS.HS-PS2-4

A light bulb provides a resistance of 20 Ω to the 30 A current that runs through it. Determine the voltage of the battery in the flashlight. 

• 200 V

• 600 V

• 1000 V

• 1200 V