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Ilia_Sergeevich [38]
3 years ago
12

Sunscreen protects your skin from sunburn. For sunscreen to be effective, it must block or absorb A. X rays. B. visible light. C

. infrared light. D. ultraviolet light.
Physics
2 answers:
egoroff_w [7]3 years ago
6 0
<span>D. ultraviolet light. this can cause cancer</span>
kolezko [41]3 years ago
4 0
The correct answer is D. UV Light.

The sun gives off harmful UV rays that can burn you and also give you a skin cancer.
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What potential difference is required to cause 4.00 a to flow through a resistance of 330 ω?
Alisiya [41]
We can solve the problem by using Ohm's law, which states that an Ohmic conductor the following relationship holds:
\Delta V = I R
where
\Delta V is the potential difference applied to the resistor
I is the current flowing through it
R is the resistance

In our problem, I=4.00 A and R=330 \omega, so the potential difference is
\Delta V = IR=(4.00 A)(330 \omega)=1320 V
7 0
4 years ago
Calculate the minimum thickness (in nm) of an oil slick on water that appears blue when illuminated by white light perpendicular
mr_godi [17]

Answer:

The minimum thickness = 83.92 nm

Explanation:

The relation between the wavelength in a particular medium and refractive index \lambda_n = \frac{ \lambda }{n}

where ;

\lambda = wavelength of the light in vacuum

n = refractive index of medium with respect to vacuum

For one phase change :

2t = \frac{\lambda_n}{2}\\\\where \ \lambda_n = \frac{\lambda}{n}\\\\Then \ \\\\2t = \frac{\lambda}{2n}\\\\t = \frac{\lambda_n}{4n}

Replacing 1.43 for n and 480 nm for λ; we have:

t = \frac{480}{4(1.43)}

t = 83.92 nm

Thus; the minimum thickness = 83.92 nm

4 0
3 years ago
Ram has power of 550 watt. What does it mean?
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It means you can do 550 Newton Meters of work every second. Power is the rate of doing work, I hope this helps
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What alleles are always both expressed
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An organism which has two different alleles of the gene is called heterozygous. Phenotypes (the expressed characteristics) associated with a certain allele can sometimes be dominant or recessive, but often they are neither.

5 0
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