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3 years ago

Why do scientists believe that light is made of streams of particles?

2 answers:

8 0

Scientists believe that light is made of streams of particles because only the presence of photons can explain phenomena observed during experiments on the photoelectric effect. These observations include only some frequencies of light causing the ejection of electrons, no time gap existing between light striking a metal and electrons being ejected, and intensity having no effect on the kinetic energy of the ejected electrons.

irina [24]3 years ago

5 0

I just need points to ask my own question.

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You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor. If you

max2010maxim [7]

Answer:

$c. 5cm \times 8cm$

Explanation:

The dimensions $5cm\times 8cm$ have the highest cross-sectional area combination of $40cm^2$ .

-Resistance reduces with an increase in cross sectional area.

- $Reason-$ Electrons have alarger area to flow through.

8 0

4 years ago

What type of wave is infrared light

GrogVix [38]

Answer: Heat waves? I’m not %100 sure

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3 years ago

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A 15.0 kg medicine ball is thrown at a velocity of 10.0 m/s to a 60.0 kg person who is a rest on ice. The person catches the bal

shutvik [7]

Answer:

The velocity of ball and man after catching ball is $2m/s$

Explanation:

Since there is no friction and no external force the momentum is conserved .

Here when man catches ball then man and ball move with common velocity .

Let the final common velocity be $v_{f}$ ,

Given that mass of the ball is $m_{b}$ = $15kg$

Given that mass of man is $m=60kg$

Initial velocity of ball = $v_{i} = 10m/s$

Now considering momentum conservation

$p_{i} =p_{f}$

$m_{b}v_{i} = (m_{b} +m)\times v\\v=m_{b}v_{i}/(m_{b} +m) = \frac{150}{75} =2m/s$

7 0

3 years ago

Read 2 more answers

What is most likely happens during a chemical change

ikadub [295]

In a chemical change, the atoms in the reactants rearrange themselves and bond together differently to form one or more new products with different characteristics than the reactants. When a new substance is formed, the change is called a chemical change.

7 0

3 years ago

Given 4.8 moles of a gas at 37 degrees Celsius and at 792 torr, what is the volume of the gas? (The ideal gas constant is 0.0821

Anastaziya [24]

Answer:

1.17 x 10^2 L

Explanation:

We can find the volume of the gas by using the ideal gas law:

$pV=nRT$