Electromagnetic Spectrum and Light Calculations

Which of the following types of light has the longest wavelength?

• x-ray

• infra-red

• ultra violet

• visible green

What causes spectral lines for elements?

• electrons jumping up to an excited state

• electrons returning to a ground state

• atoms moving faster

• atoms moving slower

What mathematical relationship do the wavelength and energy of a light photon have?

• inverse

• direct

• exponential

• no relationship

What unit is used for frequency?

• meters, m

• Hertz, Hz

• Joule, J

• grams, g

Which of the following forms of visible light has the greatest amount of energy?

• blue

• green

• yellow

• red

What is the frequency of yellow light with a wavelength of 350 nm? (speed of light = 3 x 10⁸ m/s)

• 8.57 x 10¹⁴ Hz

• 8.57 x 10⁵ Hz

• 1.05 x 10¹¹ Hz

• 5.68 x 10^-19 Hz

What does the amplitude of a light wave have an effect on?

• the color of the light

• the energy of the light

• the speed of the light

• the brightness of the light

Hydrogen has four spectral lines in the visible region. Which spectral line was caused by the biggest electron movement?

• blue-violet, 434 nm

• red, 656 nm

• violet, 410 nm

• blue-green, 486 nm

As the frequency of a light wave increases,

• the wavelength decreases.

• the energy decreases.

• the speed increases.

• the brightness increases.

What is the top of a wave called?

• trough

• crest

• amplitude

• wavelength