PHYSICS HIGH SCHOOL

Which phenomenon provides evidence that light has a wave nature?

Answers

Answer 1
Answer:

Hi Beck


The answer should be

Diffraction of light passing through a narrow opening


I hope that's help :)

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The radius of the sphere is (4.3+-0.1)cm. the % error in the vol is???
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Compared to yellow light, orange light has A. a different polarization.
B. a faster wave velocity.
C. the same frequency.
D. a longer wavelength.

Answers


Orange light always has a longer wavelength than yellow light. 
That's how your eye and brain decide that it's orange and not yellow.

What happens to water when it changes to ice?Its density increases.

Its density decreases.

Its mass increases.

Its mass decreases.

Its volume increases.

Its volume decreases.

Answers

There are two answers to this:

  • Its density decreases
  • Its volume increases

You notice that ice floats on water, this means that its density is less. The mass remains the same because you did not add or remove anything. But what causes the density to decrease then? For density to change, there needs to be a change in either the volume or the mass of the object. Density is calculate by mass/volume. Since the mass did not change, the volume must have. So in this case, the volume increases. Hence, this is what causes it to be less dense.

Answer

B and E

Explanation:

water molecules are connected with each other through hydrogen bonding

 

with what minimum speed must you toss a 160 g ball straight up to just touch the 13-m-high roof of the gymnasium if you release the ball 1.4 m above the ground? solve this problem using energy.

Answers

energy at top = m*g*height at top from release point
=0.16*9.81*11.6
=18.21J
At release kinetic energy= Gravtiational energy at top
1/2*0.16*v^2=18.21J
v^2=227.625
v=15.10m/s

Scientists have observed that the average sunspots have increased in the last 50 years. Which of these statements best describes an effect of this increase in sunspots? A) Earth's temperature has become cooler.
B) Earth's temperature has not changed over time.
C) Earth's temperature has become warmer.
D) Earth's temperature has reduced by fifty times.

Answers

Answer:

Earth's temperature has become cooler

Explanation:

The number of sunspots, as you have learned, can indicate whether the sun is in a maximum-activity period or a minimum-activity period. Some scientists believe this can have an overall effect on the climate of Earth.

The right answer for the question that is being asked and shown above is that: "B) Earth's temperature has not changed over time." Scientists have observed that the average sunspots have increased in the last 50 years. The statement that best describes an effect of this increase in sunspots Earth's temperature has not changed over time. 

what is the difference in the charges on a balloon rubbed in your hair and a glass  rod rubbed with silk? why?

Answers

The balloon steals electrons from your hair, leaving the hair positively charged, and the balloon negatively charged. It causes the hair to be apart from each other, because they have the same charge. Glass has a weaker hold on electrons, and silk absorbs the lost electrons.

Answer:The balloon steals electrons from your hair, leaving the hair positively charged, and the balloon negatively charged. It causes the hair to be apart from each other, because they have the same charge. Glass has a weaker hold on electrons, and silk absorbs the lost electrons.

How many electrons make up a charge of 3.5kC?

Answers

21.8452851 * 10^21 e. Which is 21.845.285.100.000.000.000.000 electrons. A lot.
Well now, I don't know !
Let's figure it out.

The charge on one electron is 1.60 x 10⁻¹⁹ Coulomb .

To get 3,500 Coulombs of charge, you'd need to
go around and collect

             (3,500) / (1.60 x 10⁻¹⁹)  electrons.

That's  2.19 x 10²²  of the little fellas.

That's a big number.  But what's REALLY amazing is the
mass and weight of that many electrons:

             Mass:    1.989 x 10⁻⁵ gram

             Weight:  about  0.0000007 ounce  !

That's not one electron.  That's the whole  2.19 x 10²²  uvvum
that it takes to hold 3,500 Coulombs of charge.
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