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3 years ago

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When do the heavier elements finally form? Give a few example.

1 answer:

andrew11 [14]3 years ago

5 0

Answer:

Some of the universe's heavier elements are created by neutron star collisions. ... Light elements like hydrogen and helium formed during the big bang, and those up to iron are made by fusion in the cores of stars. Some heavier elements like gallium and bromine need something more, such as a supernova.

Explanation:

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Convert the following dB to decimal a. -12 b. 3 c. 10 d. 0

stiks02 [169]

Answer:

for -12db

$\frac{V1}{V2}=0.251\\\\\frac{P1}{P2}=0.0631$

for 3db

$\frac{V1}{V2}=\sqrt{2}\\\\\frac{P1}{P2}=2$

for 10db

$\frac{V1}{V2}=3.16\\\\\frac{P1}{P2}=10$

for 0db

$\frac{V1}{V2}=1\\\\\frac{P1}{P2}=1$

Explanation:

The decibel is a logaritmic value given by:

$db=10*log(\frac{P1}{P2})=20*log(\frac{V1}{V2})$

we use 10 for power values and 20 for other values such voltages or currents.

$\frac{V1}{V2}=10^{\frac{db}{10}}\\\\\frac{P1}{P2}=10^{\frac{db}{20}}$

for -12db

$\frac{V1}{V2}=10^{\frac{-12}{10}}=0.251\\\\\frac{P1}{P2}=10^{\frac{-12}{20}}=0.0631$

for 3db

$\frac{V1}{V2}=10^{\frac{3}{10}}=\sqrt{2}\\\\\frac{P1}{P2}=10^{\frac{3}{20}}=2$

for 10db

$\frac{V1}{V2}=10^{\frac{10}{10}}=3.16\\\\\frac{P1}{P2}=10^{\frac{10}{20}}=10$

for 0db

$\frac{V1}{V2}=1\\\\\frac{P1}{P2}=1$

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3 years ago

Question 3 of 25 What is the period of a wave that has a frequency of 3 Hz?

Katarina [22]

Answer:

use the formula

Explanation:

F = 1/ T

where F stands for frequency and T stands for period

sub in 3 Hz into frequency

3 = 1/T

0.333 = T

or in a fraction form

1/ 3

hope this helps

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