Abeka 9th Science Test 5 p2

In 15 s, 12,600 waves pass a given point. What is the frequency of the waves?

• 720 Hz
• 960 Hz
• 600 Hz
• 840 Hz

Tags

NGSS.MS-PS4-1

What is the speed of a wave with a wavelength of 2.5m and a frequency of 20m/s?

• 50m/s
• 30m/s
• 40m/s
• 60m/s

What is the speed of sound in air when the temperature is 35 degrees C? Round your answer to the nearest meter per second.

• 352 m/s

• 325 m/s

• 400 m/s

• 300 m/s

Tags

NGSS.MS-PS1-4

Which is the formula for the speed of sound?

• v = 331 m/s + (0.61 m/s) (T/1degree C)

• v = N/t

• v = 1/N

• v = 1/f

Tags

NGSS.MS-PS4-1

Which is the formula for the speed of a wave?

• speed = wavelength - frequency
• speed = wavelength + frequency
• speed = frequency / wavelength
• speed = wavelength × frequency

Which is the formula for the frequency of a wave?

• f = λ / v
• f = v * λ
• f = 1/N

• f = N/t

Which is the formula for the period of a wave?

• T = f
• T = 2πf
• T = 1/f

• T=1/N

An object travelling faster than the speed of sound is said to be ________.

• subsonic
• hypersonic
• transonic
• supersonic

A periodic back-and-forth motion that transmits energy is a ______.

• vibration
• wave
• rotation
• oscillation

Tags

NGSS.MS-PS4-1

What is a sound heard distinctly after being reflected from some object?

• Noise
• Echo

• Reverb
• Soundwave

Tags

NGSS.MS-PS4-2