1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Norma-Jean [14]
3 years ago
5

An element has a half-life of 30 years. if 1.0 mg of this element decays over a period of 90 years, how many mg of this element

would remain?
Chemistry
1 answer:
labwork [276]3 years ago
6 0

Answer:

144.6

Explanation:

You might be interested in
If you put an egg on a plate will it melt ?? Im confused
Eddi Din [679]
No it would not because it’s still hard
4 0
2 years ago
A common radio wavelength observed coming from astronomical objects is 21 cm. What temperature is associated with this radiation
qaws [65]

Answer:

The temperature associated with this radiation is 0.014K.

Explanation:

If we assume that the astronomical object behaves as a black body, the relation between its <em>wavelength</em> and <em>temperature</em> is given by Wien's displacement law.

\lambda_{max}=\frac{b}{T}

where,

λmax is the wavelength at the peak of emission

b is Wien's displacement constant (2.89×10⁻³ m⋅K)

T is the absolute temperature

For a wavelength of 21 cm,

T=\frac{b}{\lambda _{max} } = \frac{2.89 \times 10^{-3} m.K  }{0.21m} =0.014K

8 0
3 years ago
Which of the following examples describes an increase in potential energy? Question 1 options: a basketball falling through a ne
MArishka [77]
Paint being carried up a ladder
4 0
3 years ago
Read 2 more answers
What is one pro and one con of mining?
blondinia [14]

Answer:

Pro exercise con suffication

Explanation:

...

8 0
3 years ago
Which of the following is a characteristic of a scientific theory
Andru [333]

Answer:

number one

Explanation:

hope I helped

8 0
3 years ago
Other questions:
  • Which statement accurately describes the atoms of a specific element?
    9·2 answers
  • List the 7 examples of energy sources that produce steam to turn the turbines of an electric generator.
    11·2 answers
  • How many hours a day do famers leave the lights on for hens to lay eggs
    11·2 answers
  • The activation energy for the reaction no2(g)+co(g)⟶no(g)+co2(g) is ea = 175 kj/mol and the change in enthalpy for the reaction
    6·1 answer
  • In a chemical reaction , atoms are created/rearranged. The atom are joined together in the same/different arrangements after the
    9·1 answer
  • What question could be asked to help determine whether the solar system is heliocentric or geocentric?
    9·1 answer
  • Molar mass of a compound containing Al3+ ion and OH- ion?
    8·1 answer
  • Why are lager astronomical bodies such as planets and stars round?
    12·2 answers
  • [10 pts]Iron and vanadium both have the BCC crystal structure and V forms a substitutional solid solution in Fe for concentratio
    5·1 answer
  • Use the data, the periodic table, and the station resources to complete the data table and answer the questions below.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!