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notka56 [123]
3 years ago
10

Rays of light incident on a lens and parallel to the principal axis of the lens converge

Chemistry
1 answer:
malfutka [58]3 years ago
4 0
Your answer is going to be B. at the focal point of the lens. :)
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Which of the following radiations consists of a helium nucleus emitted by some radioactive substances? Alpha radiation Beta radi
erica [24]

Answer: Alpha radiation

Explanation: Alpha decay : When a larger radioactive nuclei decays into smaller nuclei by releasing alpha radiation, the mass number and atomic number is reduced by 4 and 2 units respectively.

_Z^A\textrm{X}\rightarrow _{Z-2}^{A-4}Y+_2^4\textrm{He}


Beta decay : When a larger radioactive nuclei decays into smaller nuclei by releasing beta radiation, the atomic number is increased by 1 unit.


_Z^A\textrm{X}\rightarrow _{Z+1}^{A}Y+_{-1}^0e


Gamma decay : When a larger radioactive nuclei decays into smaller nuclei by releasing gamma radiation, the mass number remains same.

_Z^A\textrm{X}^*\rightarrow _Z^A\textrm{X}+_0^0\gamma

5 0
3 years ago
How does radioactive isotopes decay?
aksik [14]
They can decay through one of three ways: 
alpha decay
beta decay and
gamma decay
ALPHA- particle with two neutrons and two protons is ejected from the nucleus of the radioactive atom. this particle released is called an alpha particle. Only occurs with heavy metals.
BETA- pretty much when a proton is transformed into a neutron, or vise versa. in a beta minus decay, the nuetron decays into a proton and in a beta plus decay, a proton decays into a neutron
GAMMA- the nucleus changes from a high energy state to a low energy state by releasing electromagnetic radiation (photons). the number of protons and neutrons stay the same during this reaction therefore the element is still the same.
7 0
4 years ago
PLEASE HELP BRAINLIEST AND 15 points.
PtichkaEL [24]

Answer:

Substance B, boiling point of 105 °C

Explanation:

Non volatile substances have high boiling points

5 0
3 years ago
Pls help! Will mark brainliest! 55 Points!​
GenaCL600 [577]

Answer:

7cm square is the answer

Hope it's helpful

6 0
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PLS HURRYThe moon does not light up by itself. Instead, it reflects light from the sun. Question 10 options: True False
alukav5142 [94]

Answer:

awnser is true took the test

Explanation:

i took the test

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