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3 years ago

Critical angle of glass is 42 .what does it mean?

Physics

1 answer:

elena55 [62]3 years ago

6 0

Answer:

i think..its fraction that its have multiple fractions on it..if you minus the 397 000-355 it should be 381+ so i say if you get the 5 multiply it by 9!! so you will get it!

Explanation:

HOPE IT HELPS!!

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A piece of charcoal used for cooking is found at the remains of an ancient campsite. A 1.09 kg sample of carbon from the wood ha

fgiga [73]

Answer:

t = 17199 years

Explanation:

given,

mass of sample = 1.09 Kg

Activity of living material = 15 decays / min /g

Activity of living material = 15 x 1000 decays /min /kg

Activity of living material per 1.09 kg A = 1.09 x 15 x 1000 decays / min

Activity of after time t is A ' = 2020

half life = 57300 years

desegregation constant

λ = 0.693 / 5700

$A'= A e^{-\lambda\ t}$

$A'= 1.09 \times 15 \times 1000 e^{-\lambda\ t}$

$2020= 1.09 \times 15 \times 1000 e^{-\dfrac{0.693}{5700}\times t}$

$0.124=e^{-\dfrac{0.693}{5700}\times t}$

taking ln both side

$\dfrac{0.693}{5700}\times t = 2.09$

t = 17199 years

5 0

3 years ago

Mendeleev noticed that if he organized the elements by atomic weight certain patterns emerged. For instance, elements in the sam

Inga [223]

I've had a similar question on an assignment myself, so I'm going to assume it had the same idea.

When you organize them in such a way, the pattern that emerges tells you elements organized by atomic weight have the same number of valence electrons.

Hope this helps!

6 0

3 years ago

Read 2 more answers

Increasing the number of loops in a electromagnet or solenoid will cause it to be stronger

Zielflug [23.3K]

True

The electromagnet will become stronger if we add more coils because there are more field lines in a loop then there is in a straight piece of wire. In a solenoid there are a lot of loops and they are concentrated in the middle, as more loops are added the field lines get larger, therefore making the electromagnet stronger.

5 0

3 years ago

I need help! plz, It's about energy. its just middle school science

Anit [1.1K]

Answer:

it would be 12/A

Explanation:

if you dived 5 by 12 youll get 60 and you cant get 60 y anything else in there so therefor its 12 :)

8 0

3 years ago

if the amount of work done remains constant but occurs over less time how does this affect the amount of power exerted?

Aneli [31]

Answer:

The amount of power will be increased.

Explanation:

If the work remains constant but the time is reduced the power increases. Since power is defined as the relationship between work overtime. By means of the following equation, we can see this relationship.

$P=W/t$

where:

P = power [Watts]

W = work [J] (units of joules)

t = time [s]

Let's assume with an example the above written.

If we have an electric motor that exerts a work of 950 [J], and the time used is 5 [s], the power is:

$P = 950/5\\P = 190 [W]$

Now if we want to accelerate the work done and use 2 seconds for the time, we will have:

$P=950/2\\P=475 [W]$

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3 years ago

Critical angle of glass is 42 .what does it mean?​

Critical angle of glass is 42 .what does it mean?