Ask question

Ask question

All categories

3 years ago

12

The longest wavelength of light that causes electrons to be ejected from the surface of a potassium metal plate is 539 nm. If 40

0 nm radiation is shone on potassium, what is the velocity of the ejected electrons?

1 answer:

daser333 [38]3 years ago

7 0

Answer:The longest-wavelength light that causes an electron to be emitted from gaseous lithium atom is 520 nm.

Explanation:

You might be interested in

M<br> + e -> M-1<br> This reaction represents

arlik [135]

Answer:

Reduction.

Explanation:

Reduction is the gain of electron.

8 0

4 years ago

When ammonium nitrate is added to a suspension of magnesium hydroxide in water, the Mg(OH)2 dissolves. Write a net ionic equatio

Viefleur [7K]

Answer:

Net ionic: $Mg(OH)_{2}+2NH_{4}^{+}\rightarrow Mg^{2+}+2NH_{3}+2H_{2}O$

Explanation:

$OH^{-}$ in $Mg(OH)_{2}$ reacts with $NH_{4}^{+}$ to form $NH_{3}$ and $H_{2}O$ .

Due to this acid-base reaction, $Mg(OH)_{2}$ become soluble whenever $NH_{4}NO_{3}$ is added to suspension of $Mg(OH)_{2}$ .

In this reaction, $NH_{4}NO_{3}$ acts as an acid and $Mg(OH)_{2}$ acts as a base.

Molecular equation: $Mg(OH)_{2}+2NH_{4}NO_{3}\rightarrow Mg(NO_{3})_{2}+2NH_{3}+2H_{2}O$

Total ionic: $Mg(OH)_{2}+2NH_{4}^{+}+2NO_{3}^{-}\rightarrow Mg^{2+}+2NO_{3}^{-}+2NH_{3}+2H_{2}O$

Net ionic: $Mg(OH)_{2}+2NH_{4}^{+}\rightarrow Mg^{2+}+2NH_{3}+2H_{2}O$

7 0

3 years ago

How many atoms are in a sample of 175 grams of sodium (na)? 1.42 × 10^27 atoms 4.58 × 10^24 atoms 6.68 × 10^-21 atoms 1.26 × 10^

Alenkasestr [34]

Atomic mass Na = 22.99 u.m.a

22.99 g ------------------ 6.02x10²³ atoms
175 g -------------------- ?? atoms

175 x (6.02x10²³) / 22.99 => 4.58x10²⁴ atoms

hope this helps!

5 0

4 years ago

How do electrons differ from protons and neutrons? A. They do not move. B. They are larger. C. They are not in a fixed position.

nikdorinn [45]

Hi!

Electrons are particles which basically 'orbit' around the nucleus. Protons and neutrons are condensed, in a fixed position inside the nucleus.

With this in mind, the answer will be C.

Hopefully, this helps! =)

4 0

4 years ago

Read 2 more answers

which is an example of reversible physical change ? peeling an apple? chopping wood? cutting hair ? melting ice ?help now please

Leviafan [203]

I think cutting hair would be my answer

4 0

3 years ago

Read 2 more answers