Sound & DE

Why do women typically have higher pitched voices than men?

• women are less likely to have tonsils removed

• women are more likely to have tonsils removed

• longer vocal cords

• shorter vocal cords

We tend to lose hearing in _____ frequencies first as we get older.

• high

• low

_____ sounds are above the human hearing range, while _____ sounds are below it.

• hypersonic, hyposonic

• hyposonic, hypersonic

• infrasonic, ultrasonic

• ultrasonic, infrasonic

An increase in 10 decibels means that the sound is transporting _______ times more energy.

• 10

• 100

• 1,000

• 10,000

Hearing loss occurs after long exposure above ___ dB, within minutes at ___ dB, & causes pain at ___ dB.

• 85, 100, 120

• 60, 80, 100

• 75, 105, 125

• 50, 100, 150

When sound goes into a similar medium, most of it is _____, but it is _____ when going into a different medium.

• refracted, diffused

• transmitted, reflected

• reflected, transmitted

• refracted, reflected

If a wave hits a medium that is less dense, it reflects _____, but it is _____ when it hits something more dense.

• straight, diagonal

• inverted, upright

• upright, inverted

• diagonal, straight

An increase in 30 dB is equal to what change in energy?

• 100

• 300

• 1000

• 3000

An increase in 40 dB is equal to what change in energy?

• 10,000

• 40,000

• 400

• 100

A driver in a car traveling 55 m/s is honking the horn with a frequency of 1000 Hz.  The speed of sound is 340 m/s.  A person is standing in front of the car in the direction the car is going, & another person is standing behind the car.  Calculate the wavelength of the sound wave.

• 0.34

• 0.055

• 0.16

• 6.15