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zvonat [6]
3 years ago
11

What is the mass of 2.5 mol of Ca, which has a molar mass of 40 g/mol?

Physics
1 answer:
ipn [44]3 years ago
4 0

Answer:100 g of ca

Explanation:

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3 is the correct answer for number 8

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Monochromatic light of a given wavelength is incident on a metal surface. However, no photoelectrons are emitted. If electrons a
mrs_skeptik [129]

Answer:

Light of a shorter wavelength should be used.

Explanation:

This is studied in the phenomenon called photoelectric effect, in which light is able to release electrons from a metal, said electrons are called photoelectrons .

The experiments that have been carried out show that <u>increasing  or decreasing the intensity of the light will not cause the photoelectrons to be emitted</u>, what will cause the photoelectrons to be emitted is to increase the frequency of the incident light.

And a higher frequency corresponds to a shorter wavelength according to the equation:

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3 years ago
Sally takes two bar magnets and randomly tapes one end of each bar magnet. she labels the magnets A and B. She brings the taped
Artyom0805 [142]
I already answered this quesiton. The fact is that there are only two kind of poles and since the two taped poles of the magnets labeled A and B attracts one to each other, we know that the two taped poles of the first two magnets are oppsosite.

Then, the taped pole of the third magnet has to be equal to one of the first two taped poles and opposite to the other of the first two taped poles.

That drives you to conclude (predict)  that when she brings the taped end of the third magnet (magnet C) near each of the first two magntes, in one case they will attract each other and in the other case they will repele mutually.

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If 8000 C of charge pass through a section of wire in 2 minutes, what would the current be?
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Answer:

we know that current = charge/time

Explanation:

therefore,

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The direction of the force on a current-carrying wire in a magnetic field is
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Answer:

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The forces acting on a conductor carrying current placed in a magnetic field is analysed using the Fleming's left hand rule.

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Based on the rule, it can be inferred this current carrying wire placed in the magnetic field acts perpendicular to the magnetic field and force acting on the wire.

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