3 years ago

Why can the suns rays cause a burn but the light from a flashlight cannot harm your skin?

2 answers:

5 0

Sun Gives off UV rays which are harmful to the human skin causing the cells to get damaged which can cause a mutation in the cell why the Flashlight give off light based on battery’s and an Electrical system

Zanzabum3 years ago

3 0

^ what they said is correct!!! i just need points i’m taking 3 posts tests today,, i’m sorry!!

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A 3.50-meter length of wire with a cross-sectional area of 3.14 × 10-6 meter2 is at 20° Celsius. If the wire has a resistance of

maks197457 [2]

Answer:

$5.6\times 10^{-8}\ Ohm.m$

Explanation:

Resistivity is given by $\rho=\frac {AR}{L}$ where A is cross-sectional area, R is resistance, L is the length and $\rho$ is the reistivity. Substituting 0.0625 for R, 3.14 × 10-6 for A and 3.5 m for L then the resistivity is equivalent to