All categories

3 years ago

Please Answer this ddddd

Chemistry

1 answer:

deff fn [24]3 years ago

8 0

Answer:

I will answer it as C

Explanation:

You might be interested in

You are making a map of your state in your map scale 1 cm equals 10 km if two cities are 200 km apart how many centimeters apart

Agata [3.3K]

The answer is 20 centimeters

6 0

4 years ago

What percent of an original sample remains after 3 half-lives? After 5 half-lives?

Salsk061 [2.6K]

Answer:

Three half lives corresponds to (12)3 . So a 18 quantity of the original isotope is retained. And the percentage of quantity of a radioactive material that remains after 5 half-lives will be . ∴NN0×100=10032=3.125.

7 0

4 years ago

When a metal was exposed to light at a frequency of 4.07× 1015 s–1, electrons were emitted with a kinetic energy of 3.30× 10–19

Licemer1 [7]

Answer : The maximum number of electrons released = $1.432\times 10^{12}electrons$

Explanation : Given,

Frequency = $4.07\times 10^{15}s^{-1}$

Kinetic energy = $3.30\times 10^{-19}J$

Total energy = $3.39\times 10^{-7}J$

First we have to calculate the work function of the metal.

Formula used :

$K.E=h\nu -w$

where,

K.E = kinetic energy

h = Planck's constant = $6.626\times 10^{-34}J/s$

$\nu$ = frequency

w = work function

Now put all the given values in this formula, we get the work function of the metal.

$3.30\times 10^{-19}J=(6.626\times 10^{-34}J/s\times 4.07\times 10^{15}s^{-1})-w$

By rearranging the terms, we get

$w=2.367\times 10^{-18}J$

Therefore, the works function of the metal is, $2.367\times 10^{-18}J$

Now we have to calculate the maximum number of electrons released.

The maximum number of electrons released = $\frac{\text{ Total energy}}{\text{ work function}}$

The maximum number of electrons released = $\frac{3.39\times 10^{-7}J}{2.367\times 10^{-19}J}=1.432\times 10^{12}electrons$

Therefore, the maximum number of electrons released is $1.432\times 10^{12}electrons$

8 0

3 years ago

Examine the picture below and read the description.

inysia [295]

Explanation:

<h3>hahahahaha Hindi ko alam thanks nalang sa point</h3>

5 0

3 years ago

ANSWER ASAP! PLEASE!

Eva8 [605]

Evaporation and straining.and idk the other two

4 0

3 years ago