A few days ago
ღ❤Crystal❤ღ

Chemistry Help! Please!?

I honestly can’t figure these out….could someone give me examples similar to these, explaining how to do these… (and i’ll try working the ones here out and post them back up)

9. What is the wavelength, in meters, of a radio wave with a frequency of 540,000 Hz?

10. For each of the following frequencies of visible light, determine the wavelength and

identify the color of light associated with each frequency.

a. 6.4×1014 Hz b. 5.5×1014 Hz c. 5.0×1014 Hz

11. If the speed of light is 3 x 108 m/s, calculate the wavelength of the electromagnetic

radiation whose frequency is 7.500 x 1012 s-1.

12. Determine the frequency of light with a wavelength of 4.257 x 10-7cm.

16. What is the energy, in joules, of a photon whose frequency is 3.55 x 1017 s-1. (Plank’s

constant = 6.626 x 10-34 J×s)

17. What is the energy of a photon whose wavelength is 42.0 cm?

I don’t want an answer straight out…because i have a test monday, i want to learn them…

Top 2 Answers
A few days ago
Anonymous

Favorite Answer

You have to use the wave equation. The frequency times the wavelength equals the speed of the wave.

f*wavelength=speed

For light, the speed is constant. So you must calculate either the frequency or the wavelength depending on which is given. For the energy of a photon:

E=hv

h is planck’s constant and v is the frequency. The frequency can also be written as the speed divided by the wavelength, or C/wavelength. When asked to identify the color of light by the wavelength, look in your book for a table with these values. Repost if you need more help or email me.

Edit:

Don’t be nervous. Just stay calm and follow the steps. I’m sure you can use a calculator during the test so all you have to practice is using the equations. I’ll set up the first one for you.

First, read the question and ask yourself what you’re given and what you need to find out. Here, you’re given 2 parts of the wave equation.

frequency = 540,000 Hz

speed of wave = C (3*10^8m/s)

They’re asking for the wavelength in meters, so solve the wave equation for the wavelength.

wavelength= C/v

(v is the symbol for frequency)

There is no need to change any units because C is already in meters (if they were looking for centimeters you’d have to convert the speed to cm/s or the wavelength to cm after you finish the calculation)

Just plug the numbers into your calculator and voila, you have the wavelength in meters.

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