Bennett Mechanical Test Acoustics and Optics 5

Question 1

The change in pitch as a moving siren passes you is called the:

Accepted Answer

Doppler effect

Answer

Echo effect

Answer

Refraction effect

Answer

Resonance

Question 2

Total internal reflection in a fiber-optic cable keeps light:

Accepted Answer

Trapped inside the fiber

Answer

Spreading outward

Answer

Slowing to a stop

Answer

Changing color

Question 3

When two sound waves combine to produce a louder sound, this is:

Accepted Answer

Constructive interference

Answer

Destructive interference

Answer

Refraction

Answer

Diffraction

Question 4

A camera lens focuses an image onto the sensor by:

Accepted Answer

Refracting light to a focal point

Answer

Reflecting light backward

Answer

Absorbing stray light

Answer

Diffracting all colors

Question 5

Which of these has the highest frequency and is inaudible to humans?

Accepted Answer

Ultrasound

Answer

Infrasound

Answer

A whisper

Answer

Middle C

Question 6

An air-filled room with hard walls sounds echoey mainly because the walls:

Accepted Answer

Reflect sound waves

Answer

Absorb sound waves

Answer

Speed up sound

Answer

Lower the pitch

Question 7

The distance between two consecutive crests of a wave is the:

Accepted Answer

Wavelength

Answer

Amplitude

Answer

Frequency

Answer

Period