Problem: Article: The formula for the frequency of a wave in a vacuum is almost identical to that of a wave not in a vacuum. Since there are no outside influences on the velocity of the wave, though, you would use the mathematical constant for the speed of light, which electromagnetic waves would travel at under these conditions. As such, the formula is written as: f = C / λ  In this formula, f represents frequency, C represents the velocity or speed of light, and λ represents the wavelength of the wave. Example: A particular wave of electromagnetic radiation has a wavelength of 573 nm when passing through a vacuum. What is the frequency of this electromagnetic wave? When the problem gives you the wavelength in meters, no further action is needed. If, however, the wavelength is given in micrometers, you need to convert this value into meters by dividing it by the number of micrometers in a single meter.  Note that when working with extremely small numbers or extremely large numbers, it is generally easier to write the values in scientific notation. The values will be shown in and out of their scientific notation forms for this example, but when writing your answer for homework, other schoolwork, or other formal forums, you should stick with scientific notation. Example:  λ = 573 nm 573 nm x (1 m / 10^9 nm) = 5.73 x 10^-7 m = 0.000000573 The speed of light is a constant, so even if the problem does not provide you with a value, the value remains 3.00 x 10^8 m/s. Divide this value by the wavelength converted into meters. Example: f = C / λ = 3.00 x 10^8 / 5.73 x 10^-7 = 5.24 x 10^14 With this, you should have calculated the value of the frequency of the wave. Write your answer in Hertz, Hz, the unit for frequency. Example: The frequency of this wave is 5.24 x 10^14 Hz.
Summary: Learn the formula. Convert the wavelength into meters, if necessary. Divide the speed of light by the wavelength. Write your answer.

Problem: Article: Infants with cradle cap often have other symptoms related to dry, easily-irritated skin. Use a humidifier in your baby's room to keep the air moist and humid so his or her skin doesn't get too dry. Applying a moisturizer while the scalp is still slightly damp and warm after bathing can help trap moisture in the skin, preventing it from becoming dry and scaly. Use a lotion or ointment formulated for babies' sensitive skin. Cradle cap is in some cases caused by an allergy to baby formula. If your baby has red patches on his or her face and experiences diarrhea and other allergy symptoms in addition to cradle cap, talk to your doctor about switching to a formula that is healthier for your baby.
Summary: Humidify your home. Moisturize the baby's scalp after bathing. Consider the baby's diet.

Problem: Article: A citation should never have more than 7 names. If you're citing a work with 7 or more authors or editors, you'll have to leave out some of the names in an APA citation. Keep the names of the authors in the order they are listed on the title page of the book. Follow the sixth author's name with a comma, and then use an ellipsis to indicate there are additional authors. Make sure you include a comma after the sixth author's name. You don't need a comma after the ellipsis. Check your word processing app for an ellipsis style function – it looks like it's just a string of 3 periods, but they are spaced further apart than regular periods. Use title capitalization, meaning that only the first word of the title should be uppercase. Put the subtitle, if applicable, after a colon.For instance: "Sunshine, S. P., Brown, J. B., Honey, T., Smith, R., Grandin, T., Petty, L., . . . Sullivan, T.D. (2015). Creating APA citations for multiple authors." Finish by noting the place of publication along with the publisher. Put a colon between the two and a period at the end. For instance: "Sunshine, S. P., Brown, J. B., Honey, T., Smith, R., Grandin, T., Petty, L., . . . Sullivan, T.D. (2015). Creating APA citations for multiple authors. London: Johnson Publishing Group."
Summary: List the last names and initials of the first 6 authors. Place an ellipsis after the sixth author's name. Note the full title of the work. Include the publishing information last.

Problem: Article: It's the button with the Playstation logo in the center of your Dualshock controller.  This opens the dynamic menu on the PS4. It has an icon that resembles the Playstation logo in a curvy triangle.  Use the controller to navigate to the PS Now app on the dynamic menu and press X to open the app. If you don't see the PS Now app on your main dynamic menu, navigate all the way to the right and select Library.  Then select Applications in the sidebar to the left, and select PS Now in the Applications menu. It's below the Playstation Now icon to the right.  This launches the app. It's the third tab at the top of the screen.  Use the left stick or directional buttons on the controller to navigate to it and press X. Alternatively, if you know of a specific game you want to play, select Search instead.  Select Type to search and use the on-screen keyboard to type the name of the game you want to search for. It's the fourth box in the browse menu.  This displays a list of all available PS3 games. Use the left stick or directional buttons on the controller to navigate to a game you want to play. Then press X to open the game. It's the blue button below the game title.  This starts the game.  Allow a few moments for the game to finish loading.  Press the PS button on the controller to access the PS Now menu. Press the right side of the touchpad to press Start. Press the left side of the touchpad to press Select.
Summary:
Press the PS button on your controller. Open the PS Now app. Select Start. Select Browse. Select the PS3 games box. Select a game. Select Stream Now.