Energy, Frequency & Wavelength Classwork

Objectives

• Calculate wave speed, frequency, energy and wavelength.

• Compare the energy of different wavelengths of light.

Multiple Choice

Select the correct order of waves on the Electromagnetic Spectrum

• Radio, Micro, Infra, Visible, Ultra, X-ray, Gamma
• Gamma, X-ray, Ultra, Vis, Infra, Micro, Radio
• Vis, Micro, Infra, Ultra, X-ray, Gamma, Radio
• Micro, Radio, Vis, Infra, Ultra, X-ray, Gamma

Parts of the Wave

Drag and Drop

Drag and Drop the answer to match the numbers below

Use the picture provide <-----

1) ​

Placeholder

2)​

Placeholder

3)​ ​

Placeholder

4) ​ ​

Placeholder

Drag these tiles and drop them in the correct blank above

Trough

Bottom

Crest

Energy

Frequency

Wavelength

Amplitude

Wave

Digital

Multiple Choice

Which color in the visible spectrum of light has the longest wavelength?

• Indigo

• Red

• Blue

• Violet

Explanation Slide...

λ= wavelength (m)
v= frequency (Hz or 1/s)
c= speed of light: 2.998 × 10⁸ m/s

Multiple Choice

The symbol for wavelength Is?

• ν

• λ

• Ε

• m

Multiple Choice

The symbol for a frequency of a wave is?

• Hertz

• v

• λ

• meters/second

Multiple Choice

What is the units for speed of light?

• c

• J

• m/s

• Hz

Multiple Choice

What is the variable c used for?

• frequency

• wavelength

• Energy

• speed of light

Categorize

Options (6)

Categorize the parts of the solution into known unknown & solve.

Known

Unknown

Solve

Labelling

What is the frequency of a red laser that has a wavelength of 376 m? ​

Drag labels to their correct position on the image

E

7.97 x 10 ^6 Hz

7.97 x 10 ^5 Hz

λ

376 m

2.998 x 10 ^ 8 m/s

c

Multiple Choice

Calculate the wavelength of the yellow light emitted by the street light, if the frequency of the radiation is 5.10x10¹⁴Hz.

• 5.12 x 10^-7m

• 5.88 x 10^-7 m

• 4.20 x 10¹⁴m

• 3.0 x 10⁸m

Multiple Choice

What is Planck's Constant

• 6.626x10^-34 Js
• 6.626x10^-34 J/s
• 3.0x10⁸ ms
• 3.0x10⁸ m/s

Multiple Choice

What is the frequency of light with a wavelength of

4.8 x 10^-7 meters?

• 5.34 x 10^-9 Hz

• 3.0 x 10⁸ Hz

• 3.21 x 10¹⁷ Hz

• 6.25 x 10¹⁴ Hz

Multiple Choice

When calculating for wavelength from from the frequency what constant do we use?

• speed of light

• Planck's constant

• speed of sound

• Rutherford's constant

Multiple Choice

When calculating for wavelength from from the frequency what mathematical function do we perform with the constant?

• addition

• division

• multiplication

• substraction

Energy in EM Waves

The energy of an EM wave depends on its frequency.

An EM wave can be useful. For example, visible light allows you to see, and microwaves allow you to cook dinners quickly. High-frequency EM waves — such as those used in medical tests or treatments — can also be useful, but X-rays or gamma rays can be very dangerous if not used in very small and controlled amounts. That's why you wear a lead apron when you get an X-ray at the dentist's office.

The higher the frequency of an EM wave, the more energy it has. Here is the equation for calculating the energy of any EM wave:

E = hν

The letter h represents a constant called Planck's constant. It always has the value 6.626 × 10^–34 J·s. 

Multiple Choice

When calculating for energy from from the frequency what constant do we use?

• speed of light

• Planck's constant

• speed of sound

• Rutherford's constant

Match

Match the variable with the part of the equation

• E

• h

• v

Energy

Planck's Constant

frequency

• Energy

• Planck's Constant

• frequency

Dropdown

Solve Problem 5 in your notebook and put the answer here:

E=​

Select answer

×10^​

Select answer

​

Select answer

​Use the
next few
slides as a
tutorial for
the
problem
you copied
yesterday
Copy the
answer

Multiple Choice

What is the energy of a radio wave with a wavelength of 1000 m?

• 0.02 J

• 2 x 10^–28 J

• 2 x 10⁴⁰ J

It's a different Equation:
v=E/h

Solve these problems in your Notebook.