Topic 9 - Principle of Visual Signals

What is the range of light wavelength that a typical human eye will response to?  

• 300nm to 700nm

• 390nm to 600nm

• 300nm to 750nm

• 390nm to 700nm

Which color has the shortest wavelength?

• Red

• Green

• Violet

• Blue

Which one of the following shows the absorption of light?

• A

• B

• C

• None of the above

What is the wavelength range for red light?

• 700nm – 635nm

• 635nm – 590nm

• 590nm – 560nm

• 560nm – 520nm

A datasheet of a projector was shown below. What are the lumens for the model EB-982W?

• 4000 lumens

• 4100 lumens

• 4200 lumens

• 4300 lumens

A measure of a surface or subject’s reflectivity in a given direction

• Back light

• Luminance

• Brightness

• Aperture

If the projector has a resolution of 1280 x 720, calculate the aspect ratio of the screen required.

• 16:9

• 16:10

• 4:3

• 4:5

What should be the label at "A" shown in the picture?

• Angle of incidence

• Reflected ray

• Angle of reflection

• Incident ray

The proportion of an image, width divided by height is referred as

• Aperture

• Attribute of light

• Angle of view

• Aspect ratio

A radio station broadcast at a frequency of 102.1 MHz, what is the length of the radio in meters? (Hint: Speed of light is 3 x 10⁸)

• 1.90m

• 2.30m

• 2.60m

• 2.94m