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3 years ago

15

When electrons move down energy levels, are they gaining or losing energy?

1 answer:

kap26 [50]3 years ago

5 0

When they move closer to the nucleus, they are said to be losing energy; however, they most likely move up through the shells and gain energy. Also, they are unstable in the new shells, so they usually return to their original shells and expel the extra energy through photons or other means.

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By evaluating their dot product, find the values of the scalar s for which the two vectors ~b = ˆx + syˆ and ~c = ˆx−syˆ are ort

AlladinOne [14]

Answer:

$s=\pm 1$

Explanation:

The dot product of two vectors $\vec{a}=a_1\vec{x}+b_1\vec{y}$ and $\vec{b}=a_2\vec{x}+b_2\vec{y}$ is given by

$\vec{a}\cdot\vec{b}=a_1\cdot a_2+b_1\cdot b_2$

The dot product of two orthogonal vector is always zero thus if $\vec{a}=\vec{x}+s\vec{y}$ and $\vec{b}=\vec{x}-s\vec{y}$ , their dot product would be

$\vec{a}\cdot\vec{b}=1\times1+s\times-(s)=1-s^2=0$

$\implies 1-s^2=0$

$\implies s^2=1$

$\implies s=\pm 1$

4 0

3 years ago

Gave and example of each of exothermic and Dictyledor

TEA [102]

Answer:

Making of an ice cube. Making ice cube is a process of liquid changing its state to solid. ...

Snow formation in clouds. ...

Burning of a candle. ...

Rusting of iron. ...

Burning of sugar. ...

Formation of ion pairs. ...

Reaction of Strong acid and Water. ...

Water and calcium chloride.

Explanation:

8 0

3 years ago

an object is thrown horizontally off a cliff with an initial velocity of 5.0 meters per second. the object strikes the ground 3.

Olegator [25]

You know that the formula for finding horizontal displacement is;

s=uₓt
s=(5 m/s)(3s)
s=15 m

Therefore, the ball travelled 15 m.

Hope I helped :)

7 0

3 years ago

Read 2 more answers

the half-life of iodine-131 is 8.1 days. how much time had passed if i only have one-fourth of the original sample?

morpeh [17]

Answer:

16.2 days

Explanation:

Find the number of halflives:

1/2 * 1/2 = 1/4 so <u>two</u> halflives have passed

2 * 8.1 days = 16.2 days

8 0

1 year ago

2. A new racecar track is being created, and the owners want the cars to complete 10

jeka57 [31]

Answer:

0.45 miles

Explanation:

since, car will be running on the edge of track, distance covered in one lap by car will be equal to circumference of track.\

we will use value of pi as 22/7

Circumference for any circular shape is given by $\piD$ $\pi D$

Hence, in one lap $\pi D$ distance will be covered

in 7 laps $7 \pi D$ distance will be covered.

but is given that 7 laps should be equal to 10 miles

so 10 miles will be equal to $7\pi D$

$7\pi D= 10 \ miles\\=> 7*(22/7)* D= 10 \ miles\\=> 22D = 10 \ miles\\=> D = 10/22 \ miles\\=> D = 0.45 \ miles$

Thus, diameter of track will be 0.45 miles to meet the requirement.

3 0

3 years ago