10th Class Chapter 7 Physics Long Questions

Nuclear Fusion:

When two lighter nuclear combine to from a higher nucleus,with the release of energy the process is called nuclear fusion.

Explanation:

The mass of the final nucleus is always less than the masses of the original nucleus according to mass energy relation this loss of mass converts into energy if an atom of deuterium is fused with an atom of tritium than a itelium nuclers or alpha particular is formed as given by:

Ih2+i3h_____4/3 He+on1+energy

Nuclear Fusion:

When two lighter nuclear combine to from a higher nucleus,with the release of energy the process is called nuclear fusion.

Explanation:

The mass of the final nucleus is always less than the masses of the original nucleus according to mass energy relation this loss of mass converts into energy if an atom of deuterium is fused with an atom of tritium than a itelium nuclers or alpha particular is formed as given by:

Ih2+i3h_____4/3 He+on1+energy

A floppy disk:

A floppy disk I s a small magnetically sensitive flexible plastic wafer housed in plastic case it is coated with a magnetic used to coat casseltes and video tapes, most personal computers include at leat one disk drive that allows the computer to write it and read from floppy disk.

Hard disk:

Most users rely on hard disks as their primary storage devices ,A hard is a rigid magnetically sensitive disk that spins rapidly and continuously inside the computer chassis or in a separate box connected to the computer housing.

Nuclear fission take place when a heavy nucleus such as U-235 splits or fission into to smaller nucles by absorbing a slow moving neutron

In nuclear fission to total mass of the products is less then the original mass of the heavens nucless Measurements of the showed that about 200 Mev of energy is released in each fission event.

Fission chain reaction is U-235

Electronic mail:

One of the most widely used application of internet is electronic mail which provides very fast delivery of message to any enabled site on the internet.

Fast communication:

We can send message anywhere in the world instantly

Cost free service:

If we have an internel access then wew can avail the mail services free of cost.

Simple to use:

After initial set up of e-mail account it is easy to use .

More efficient:

We can send our message to many friends or people only in one action.

Versatile:

Pictures or the other files can also be sent through e-mails internal has proved to be very beneficial to us.

Given data:

Half-life= II/2 = 10 minutes

Initial count rate= No 368/minutes

To find:

Time during which 23 cuourt /minute

Left = t=?

Calculation:

I st half- life =1/2 (368) =184 count/min

2^nd half -life = ½ (184)

3^rd half –life =1/2 (92)

=46 -

4^th half-life =1/2 (46)

=23 count/min

= 4 half lives

So the time required by radianation element to attain count rate 23c/min =

T = 4^th /12/

=4 *10

40 minutes.

SI unit Becquerel (Bq) the elements whose atomic number is greater than 82 are unstable and these elememt amit radiation naturally.

The important part of computer is CPU monitor keywords mouse etc.

The important part of computer is CPU monitor keywords mouse etc.

Alpha rays

Beta rays

Gamma rays

Data is raw unorganized facts that need to be processed raw material is called data.

When data are processed inter preled organized processed data is called information.

The number of protors in the nucleas is atomic number and denoted by Z sum of protors and neutrons is called atomic mass number and denoted by A.

A floppy iss a small magnetically sensitive flexible plastic unter housed in plastic case.

The phenomena by which radiatiors split matter into positive and negative ions is called ionization the strength of radiation to penetrate into the matter.

A fex machine basically scans a page to convert its text and graphic into electronic signals and transmits it to another fax machine through telephone line.

The time during which half of the instable radioactive nucler disintegrate is called to half life of the radioactive element.

Hard disk:

Host users rely on hard disks as their primary storage device.

Index hole:

A small hole punched into a hard sectored floppy disk that serves to mark the strait of the sector on each tract.

Yes radioactivity I spontaneous process radioactive decay involves the spontaneous trans formation of one element into another.

We can send message anywhere in the world instantly if we have an internet access then we can avail the email services free of cost.

Radiations present in atmosphere due different radioactive substance are called background radiatior.

The elements whose atomic number is greater then 82 are unstable and those element emit radiations naturally.

Central processing unit

It is concerned with the scientific methods and means to share and process vast amount of information instantly.

Modern version of photo phone or video phone is a telephone through which speakers can see the pictures of each other.

A particle representing a quantum of light or other electromagnetic radiation.

Natural:

The spontaneous emission of radiation by unstable nuclei is called natural radio activity.

The strength of radiation to penetrate into the matter is called penetrating ability /power.

In offices computer are used for preparing documents and reports, architects use them for building designing and city planning .

Medical treatment

Carbon dating

Tracers

Such a use of computer through which we can write a letter prepare sports and book etc.

Fusion reaction:

The process of splitting up a heavy nuclei with release of large amount of energy

Fission fragments:

Where U* .236 is an intermediate state that lasts only for a fraction of second before splitting into nuclei x and y is called fussion fragment.