# physics

Ultraviolet light is typically divided into three categories. UV-A, with wavelengths between 400 and 320 , has been linked with malignant melanomas. UV-B radiation, which is the primary cause of sunburn and other skin cancers, has wavelengths between 320 and 280 . Finally, the region known as UV-C extends to wavelengths of 100 .
Find the range of frequencies for UV-B radiation.

1. 👍
2. 👎
3. 👁
1. λ=c/f
f₁=c/λ₁=3•10⁸/320•10⁻⁹ =9.375•10¹⁴ Hz
f₂=c/λ₂=3•10⁸/280•10⁻⁹ =1.071•10¹⁵ Hz

1. 👍
2. 👎

## Similar Questions

1. ### physics

A 75 W light source consumes 75 W of electric power. Typically only about 5% of this energy is emitted as visible light of wavelength 600 nm. (a) Calculate the frequency of the emitted visible light. (b) How many photons per

The compound eyes of bees and other insects are highly sensitive to light in the ultraviolet portion of the spectrum, specifically light with wavelengths between 300.0 nm and 400.0 nm. To what frequencies do these wavelengths

3. ### Science

What is the order of the electromagnetic spectrum from highest to lowest energy. I got Radio, Microwave, Infrared, Visible light, Ultraviolet light, X-ray, and Gamma ray. Am I correct? If not, please help me so I can put it in the

4. ### Science

White light moves through a prism and separates into colors in the following order: red, orange, yellow, green, blue, and violet. Which of the following choices correctly describes why the violet ray is at the bottom while the red

1. ### astronomy

A line in star's spectrum lies at 400.0 nanometers. In the laboratory, that same line lies at 400.2 nanometers. How fast is the star moving along the line of sight; that is, what is its radial velocity? Is it moving toward or away

2. ### Physics. URGENT Help Please

What is the separation of colors in a rainbow produced by? (Points : 1) different diffraction for different wavelengths different interference for different wavelengths

3. ### Physics

Ultraviolet light causes sunburns, whereas visible light, even of greater intensity, does not. Why?

4. ### Science

Identify the dependent and independent variables in the following experiments. 1. Height of bean plants is recorded daily for 2 weeks. 2. Percent absorption by a pigment is measured for red, blue, green, and yellow wavelengths of

1. ### AP CALCULUS

A girl is flying a kite at a height of 320 ft. If the wind blows the kite horizontally at a rate of 15 feet per second away from the girl, at what rate is the girl releasing the string when the length of the string is 400 ft?

2. ### Science

Which part of the electromagnetic spectrum is divided into seven ranges of wavelengths and is the part visible to the human eye? A Television waves B Visible light C infrared light D telemetry waves I believe it's visible light?

3. ### Physical Science

QUESTION---Which waves have wavelengths longer than those of visible light? MY ANSWER--Infrared light, microwaves and radio waves have wavelengths longer than visible light. Radio waves have the longest wavelength. Are there any

4. ### Physics

We hear people talk of "ultraviolet light" and "infrared light." Why are these terms misleading? Why are we less likely to hear people talk of "radio light" and "X-ray light"?