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3 years ago

Sensitive instruments can detect the passage of as few as 60 electrons/s. To what current does this correspond?

Physics

1 answer:

RSB [31]3 years ago

6 0

Answer:

$9.6\cdot 10^{-18} A$

Explanation:

Current is defined as

$I=\frac{Q}{t}$

where

Q is the charge passing through a given point

t is the time interval

The SI unit of the current is the Ampere (A), where

$1A = 1C/s$

which means 1 Ampere is 1 Coulomb per second.

The charge of 1 electron is (in magnitude)

$e=1.6\cdot 10^{-19}C$

So, the charge of 60 electrons is

$Q=Ne=(60)(1.6\cdot 10^{-19})=9.6\cdot 10^{-18} C$

Therefore, if there are 60 electrons passing per second, the current is

$I=\frac{9.6\cdot 10^{-18} C}{1 s}=9.6\cdot 10^{-18} A$

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In a lab experiment, two identical gliders on an air track are held together by a piece of string, compressing a spring between

ddd [48]

Answer:

Part a)

$v_2 = -0.300$

Part b)

Here final kinetic energy is more than the initial kinetic energy

This increase in kinetic energy is due to spring connected between them as the spring energy is converted into kinetic energy of two blocks

Explanation:

Part a)

As we know that there is no external force on the system of two gliders

So here we can use momentum conservation for two gliders

So we will have

$m_1 v_1 + m_2 v_2 = (m_1 + m_2)v_i$

$m_1 = m_2$

$1.300 + v_2 = 2(0.500)$

$v_2 = -0.300$

Part b)

now we will have

initial kinetic energy of both gliders is given as

$K_i = \frac{1}{2}(m + m)(0.500)^2$

$K_i = 0.25m$

Final kinetic energy of two gliders

$K_f = \frac{1}{2}m(0.300)^2 + \frac{1}{2}m(1.300)^2$

$K_f = 0.89 m$

so here final kinetic energy is more than the initial kinetic energy

This increase in kinetic energy is due to spring connected between them as the spring energy is converted into kinetic energy of two blocks

8 0

3 years ago

Is the wood from trees a electrical conductor or electric insulator

insens350 [35]

Wood is typically an insulator(resists flow of electricity though it)
However, wet wood can be a conductor so really it depends

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3 years ago

By applying a force of one Newton, one can hold a body of mass _

SVEN [57.7K]

Answer:

By applying a force of one Newton, one can hold a body of mass of 102 gram.

Explanation:

Force is the pull or push of an object. It can be mathematically measured as, F= m* g.

where, F= force in newton

m= mass in kg

g= acceleration due to gravity ( $meter/second^{2}$ )

For 1 newton force,

F= m* 9.8

or, m= $\frac{1}{9.8}$ = 0.102 kg

or, m= 102 gram.

Hence, 102 gram mass can be hold by one Newton force.

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4 years ago

Which statement best describes electrons?

crimeas [40]

They are positive and remain inside the nucleus.

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2 years ago

Charity wants to be a biologist some day. To prepare for her career, she decides to study her pet rabbit's behavior. Every eveni

aleksandr82 [10.1K]

According to the chart concluded by Charity's observation, her rabbit prefers lettuce over celery and carrots and majority of rabbit species follows the same.

Answer: Statement A

<u>Explanation:</u>

As per the biological observations, it's is proven that leafy vegetables such as lettuce is worth for rabbits health as compared to carrots being involved in their daily diets as it contains sugar. According to the observations that Charity has gone through a month for her pet rabbit, it seems that her rabbit is most likely preferring lettuce over carrots and celery.

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3 years ago