Ujian Ulang - ASAT - Physics Kelas 8

A transverse wave is moving along a string. The diagram shows the position of the string at a certain time. Which two labeled points are one wavelength apart?

• W and X

• W and Z

• X and Z

• Y and Z

A wave has a wavelength of 10 m and a speed of 340 m/s. What is the frequency of the wave?

• 34 m/s

• 3400 Hz

• 3400 m/s

• 34 Hz

The diagram shows a wave. Which labeled distance represents the wavelength?

• A

• B

• C

• D

This diagram depicts a wave. How many wavelengths are there between X and Y?

• 2/3

• 1

• 1.5

• 3

A sound wave with a frequency of 2 kHz travels through a substance at a speed of 800 m/s. What is the wavelength of this wave?

• 0.4 m

• 2.5 m

• 400 m

• 1600 m

This diagram represents a water wave. Which row shows the amplitude and wavelength of the wave?

• A: Amplitude 1 m, Wavelength 2 m

• B: Amplitude 1 m, Wavelength 4 m

• C: Amplitude 2 m, Wavelength 2 m

• D: Amplitude 2 m, Wavelength 4 m

An echo-sounder on a ship generates a sound pulse. The echo is received by the echo-sounder after two seconds. The speed of sound in seawater is 1500 m/s. What is the depth of the seawater below the ship?

• 750 m

• 1500 m

• 3000 m

• 6000 m

Which line states whether light waves and sound waves can propagate in a vacuum?

• A: Sound Waves No, Light Waves No

• B: Sound Waves No, Light Waves Yes

• C: Sound Waves Yes, Light Waves No

• D: Sound Waves Yes, Light Waves Yes

The wave has a frequency of 5 Hz and a speed of 25 m/s. What is the wavelength of the wave?

• 5 m

• 125 m

• 5 m/s

• 25 m/s

If you see an object that is red, what does it mean?

• The object absorbs only red wavelengths

• The object reflects only red wavelengths

• The object reflects only white wavelengths

• The object refracts light