All categories

3 years ago

Explain how you can work out the

Physics

1 answer:

Ne4ueva [31]3 years ago

8 0

Answer:

The speed of light changes as it moves between media. This causes refraction. Angles of refraction can be calculated using known speeds or wavelengths. Beyond the critical angle, light is reflected.

You might be interested in

At a certain distance from a point charge, the potential and electric field magnitude due to that charge are 4.98 V and 12.0 V/m

Finger [1]

Answer:

1. d = 0.415 m.

2. Q = 2.285 x 10^{-10} C.

Explanation:

The electric field and potential can be found by the following equations:

$E = \frac{1}{4\pi\epsilon_0}\frac{Q}{r^2}\\V = \frac{1}{4\pi\epsilon_0}\frac{Q}{r}$

Applying these equations to the given variables yields

$E = 12 = \frac{1}{4\pi\epsilon_0}\frac{Q}{d^2}\\V = 4.98 = \frac{1}{4\pi\epsilon_0}\frac{Q}{d}$

Divide the first line to the second line:

$\frac{12}{4.98} = \frac{ \frac{1}{4\pi\epsilon_0}\frac{Q}{d^2}}{\frac{1}{4\pi\epsilon_0}\frac{Q}{d}}\\\frac{12}{4.98} = \frac{1}{d}\\d = 0.415~m$

Using this distance in either of the equations give the magnitude of the charge.

$12 = \frac{1}{4\pi\epsilon_0}\frac{Q}{(0.415)^2}\\12 = \frac{1}{4\pi (8.8\times 10^{-12})}\frac{Q}{(0.415)^2}\\Q = 2.285 \times 10^{-10}~C$

8 0

3 years ago

Taking the resistivity of platinoid as 3.3 x 10-7 m, find the resistance of 7.0 m of platinoid wire of average diameter 0.14 cm.

Gnoma [55]

Answer:

$1.5 \Omega$

Explanation:

The resistance of a wire is given by:

$R=\frac{\rho L}{A}$

where

$\rho$ is the resistivity of the material

L is the length of the wire

A is the cross-sectional area of the wire

For the wire in this problem:

$\rho = 3.3\cdot 10^{-7} \Omega m$

L = 7.0 m

r = d/2 = 0.07 cm = 0.0007 m, so the area is

$A=\pi r^2=\pi(0.0007)^2=1.54\cdot 10^{-6}m^2$

Solving for R,

$R=\frac{(3.3\cdot 10^{-7})(7.0)}{1.54\cdot 10^{-6}}=1.5 \Omega$

8 0

3 years ago

The smallest unit of an element that maintains the properties of that element

puteri [66]

Answer:

I think your answer is Atoms .

Explanation:

Defination of Atoms?

An Atoms is the smallest unit of an element that still has all the properties of that substance.

6 0

3 years ago

What causes earthquakes and volcanic erruptions

Scorpion4ik [409]

Tectonic plates under the ground ,either go on top of each other or crash.

6 0

3 years ago

Read 2 more answers

Please help with both will give brainlist worth 20

REY [17]

Answer:

Second bubble

Explanation:

Its going up

7 0

3 years ago