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alexgriva [62]
3 years ago
15

Combining which of the following substances with germanium will cause the germanium to emit free electrons?

Physics
2 answers:
Sliva [168]3 years ago
5 0
The appropriate response is Gallium. It is a concoction component with image Ga and nuclear number 31. It is in gathering 13 of the occasional table and subsequently has similitudes to alternate metals of the gathering, aluminum, indium, and thallium.
vladimir1956 [14]3 years ago
4 0

On page 94 it explains that The electrical resistance of germanium or silicon can be reduced to a very small fraction of its original value by combining either material with an extremely small percentage of a suitable impurity. In one type of combination, called negative,or N-type,the impurity causes the germanium or silicon to emit free electrons. Arsenic, bismuth, and antimony are suitable impurities for this purpose. In another type of combination, called positive,or P-type,the impurity causes the germanium or silicon to collect free electrons. Aluminum, indium, and gallium are suitable impurities to cause this effect.

It is asking what would cause it to emit free electrons not what causes it to collect free electrons. So the Answer is A. Bismuth

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Plan an experiment to measure the ideal mechanical advantage of a three-hole punch. (a) What materials would you need? (b) What
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Answer:

A) Three hole punch and either a layered plastic or paper

B) Identify the lengths involved  ,

  Length of input arm / length of output arm = L1/ L2

Explanation:

<u>a) Materials involved includes :</u>

Three hole punch and either a layered plastic or paper

Identify the forces acting on the three-hole punch which are Input and output forces

Identify the points where they act

<u>B) procedures involved </u>

The mechanical advantage = output force / input force

step one:  Identify the lengths involved

assuming no friction or relatively small friction \

mechanical advantage can be calculated as : Length of input arm / length of output arm = L1/ L2

7 0
3 years ago
A person observes a firework display for A safe distance of .750 km. Assuming that sound travels at 340 m/s in air what is the t
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Answer:

t = 2.2 s

Explanation:

Given that,

A person observes a firework display for A safe distance of 0.750 km.

d = 750 m

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v=\dfrac{d}{t}\\\\t=\dfrac{d}{v}\\\\t=\dfrac{750\ m}{340\ m/s}\\\\t=2.2\ s

So, the required time is 2.2 seconds.

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