Answer:
<em><u>≅ 50, 909 nm</u></em>
Explanation:
Wavelength, λ = 
Given:
speed of light = 
f = 5.89 × 
∴ λ = 3×
/ 5.89 ×
= 0.0000509 m <em><u>≅ 50, 909 nm</u></em>
<em><u /></em>
<em>Let me know if you need further assistance</em>
Answer:
matter is anything that has mass and takes up space
Explanation:
B mass number because it can be observed with out changing the element
I believe it means that it takes a lot of heat in joules to make silicon vaporize so it stays solid until a great deal of heat has been added. By comparison, water has a latent heat of about 2260 joules per gram so vaporizes much more readily than silicon.
Answer:
¹⁶⁸₇₉Au
Explanation:
The symbol of the atom is given as;
¹⁷²₈₁Tl
If undergoes a nuclear reaction and it ejects an alpha particle;
An alpha particle is the same as an helium atom
¹⁷²₈₁Tl → ₂⁴H + ₐᵇK
K is the hypothetical symbol of the new atom
b is the new mass number
a is the new atomic number;
Conserving mass number;
172 = 4 + b
b = 172 - 4 = 168
Conserving atomic number;
81 = 2 + a
81 - 2 = a
a = 79
The new compound is gold with a symbol of;
¹⁶⁸₇₉Au
