A radioactive substance does not emit

The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then

A

$${\frac{3}{4}^{{\text{th}}}}$$ of it will disintegrate in two months

B

It will completely disintegrate in two months

C

It will completely disintegrate in four months

D

$${\frac{l}{8}^{{\text{th}}}}$$ of it will remain intact at the end of four months

নিম্নের বিক্রিয়ায় কোনটি Y? 2412Mg →emit one β-rayX →emit one σ-rayY

A

2713AI

B

2311AI

C

2413AI

D

2011AI

240 radioactive grams of goo loses half its radioactivity every 10 days. How many grams of radioactive goo is left in 40 days?

A

120

B

60

C

15

D

none

Out of the following, which is not emitted by radioactive substance?

A

Electrons

B

Electromagnetic radiations

C

Alpha particles

D

Neutrons

Emission of β-particles during radioactive decay of a substance is from

A

Innermost shell

B

Nucleus

C

Outermost shell

D

None of these

যদি কোন তাপ ইঞ্জিন হতে কোন তাপ নির্গত না হয় তবে ইঞ্জিনের দক্ষতা কত হবে? (What will be the efficiency of a heat engine, if it does not emit any heat?)

A

0%

B

50%

C

75%

D

100%

Why does'nt the hydrogen atom emit X-rays?

A

It is very small in size

B

It has only one electron

C

Its energy levels are very close to each other

D

it is highly electropositive

Choose the lettered word or phrase that is most nearly opposite in meaning to the word in capital letters. EMIT :

A

Absord

B

demand

C

mistake

D

prevent

Geysers have often been compared to volcanoes _______ they both emit hot liquid from below the Earth's surface.

A

due to

B

because

C

in spite of

D

regardless of

The meaning of the word 'Emit'?

A

to discharge

B

to render

C

to turn into

D

to escape

A radioactive substance does not emit

Related Questions