Help on standard form for calculator!?

Question

My calculator doesnt have standard form on it. If anyone does have a standard form calculator on it please do these.

Speed of light: 3x10to the power of 8 (pretend theres a little 8 at the top right of the 10)

Red light has a wavelength of 7.5x10to the power of -7 (Again pretend theres a little -7 at the top right of the 10)

Blue light has a wavelength of 4.0x10to the power of -7 (same thing again)

Use the wave equation to find out:

The frequency of red light

The frequency of blue light

All you do is divide the wavelength of each light by the speed of light and can you do the answer in standard form like 5x10 to the power of 15 (if you can)

Thank you alot in advance

Answer 1

Anna

You can do these without needing standard form on your calculator

For example

(7.5 x 10^-7) / (3 x 10⁸) = (7.5 / 3 ) x (10^-7/10⁸)

7.5 / 3 you can do on your calculator it's 2.5

10^-7 / 10 ⁸ you can do using properties of exponents, it's 10 ^{-7 - 8} = 10 ^-15

Then just put the two together, 2.5 x 10 ^-15

The other one you can do yourself, in the same way

Mike