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3 years ago

Which statement describes how the photoelectric effect causes an electric

Physics

2 answers:

alina1380 [7]3 years ago

8 0

Answer:

A. Light acts as particles, causing electrons on the surface it strikes to be destroyed.

Explanation:

The photoelectric effect is a phenomenon that occurs when light shined onto a metal surface causes the ejection of electrons from that metal. It was observed that only certain frequencies of light are able to cause the ejection of electrons.

seraphim [82]3 years ago

7 0

Answer: C

Explanation: I just took the test

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Water flows through a horiztonal pipe at a rate of 94 ft3/min. A pressure gauge placed on a 3.3 inch diameter section of the pip

LuckyWell [14K]

Answer:

The gauge pressure is 1511.11 psi.

Explanation:

Given that,

Flow rate = 94 ft³/min

Diameter d₁=3.3 inch

Diameter d₂ = 5.2 inch

Pressure P₁= 15 psi

We need to calculate the pressure on other side

Using Bernoulli equation

$P_{1}+\dfrac{1}{2}\rho v_{1}^2=P_{2}+\dfrac{1}{2}\rho v_{2}^2$

We know that,

$V=Av$

$v=\dfrac{V}{A}$

Where, V = volume

v = velocity

A = area

Put the value of v into the formula

$P_{1}+\dfrac{1}{2}\rho (\dfrac{V}{A_{1}})^2=P_{2}+\dfrac{1}{2}\rho (\dfrac{V}{A_{2}})^2$

Put the value into the formula

$15+\dfrac{1}{2}\times0.36\times(\dfrac{2707.2\times4}{\pi\times(3.3)^2})^2=P_{2}+\dfrac{1}{2}\times0.36\times(\dfrac{2707.2\times4}{\pi\times(5.2)^2})^2$

$P_{2}=15+\dfrac{1}{2}\times0.036\times(\dfrac{2707.2\times4}{\pi\times(3.3)^2})^2-\dfrac{1}{2}\times0.036\times(\dfrac{2707.2\times4}{\pi\times(5.2)^2})^2$

$P_{2}=1525.8\ psi$

We need to calculate the gauge pressure

Using formula of gauge pressure

$P_{g}=P_{ab}-P_{atm}$

Put the value into the formula

$P_{g}=1525.8-14.69$

$P_{g}=1511.11\ psi$

Hence, The gauge pressure is 1511.11 psi.

7 0

3 years ago

What is a name given to the areas of an atom where electrons are found?

mestny [16]

Answer:

Shells and Shapes Electrons are found in clouds

Explanation:

3 0

3 years ago

ann drove to the store 10 km north of her house and then drove to the library which is 5 km south of the store

lbvjy [14]

5 km North

Your welcome

4 0

3 years ago

One or more calcium ions (Ca+2) combine with one or more chlorine ions (Cl-1). What is the resulting formula?

N76 [4]

The formula is CaCl2 as you need two Cl ions in order to combine with one Ca ion in order to form a neutral compound i.e. You need to have the same amount of charges therefore you have two Cl ions which have -1 charges for one +2 Ca ion.
Hope this helps :).

5 0

4 years ago

To which class of compounds does ammonia belong?

12345 [234]

Depends what you want . 1 it belongs to hydrides , it is nitrogen hydride . 2 if you want to use the property given ( and i presume you mean pH ) then it is a base . 3 because it is a soluble base , it is called an alkali .

6 0

3 years ago