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Physics > Physical World > Flashcards

Physical World Flashcards

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1
Q

What is the field particle for gravity?

A

Graviton

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2
Q

What is the field particle of weak forces?

A

neutrino

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3
Q

What is the field particle of electromagnetic forces

A

photon

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4
Q

What are weak forces?

A

Forces which cause light elementary particles to interact with one another and heavier particles.

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5
Q

What are strong forces?

A

They are the force responsible for holding neutrons and protons together inside the nucleus.

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6
Q

What is the field particles for strong forces?

A

pi-meson

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7
Q

What is the ratio of gravity:weak:electromagnetic:strong

A

1 : 10^26 : 10^36 : 10^39

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8
Q

What is 1 fermi in metres?

A

10^-15m

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9
Q

Define one parsec

A

One parsec is the distance at which the average radius of the earth’s orbit around the sun would subtend an angle of 1’’.

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10
Q

What is the least count of vernier calipers?

A

value of one main scale division/number of divisions on vernier scale

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11
Q

What is the least count of screw gauge?

A

the pitch of screw/total number of divisions on head scale

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12
Q

What are the three methods of measuring distance by reflection?

A

RADAR, LASER, SONAR

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13
Q

What are the different types of errors?

A
  1. Systematic
    a. Instrumental
    b. Imperfection in apparatus
    c. Gross
  2. Random
    a. Small changes in conditions
    b. incorrect judgement
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14
Q

What are dimensions?

A

Dimensions are the powers to which mass, length and time are raised to in order to obtain the derived unit of the quantity.

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15
Q

State some non dimensional variables.

A

strain, relative density, angle

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16
Q

State some dimensional constants.

A

gravitational constant, Planck’s constant

17
Q

State some non dimensional constants.

A

joule’s constant, pure numbers

18
Q

State the uses of dimensions.

A
  1. To convert a system of units
  2. to verify the equation
  3. to establish a relation between quantities
19
Q

State the limitations of dimensions.

A
  1. The value of dimensionless constants cant be verified
  2. the relation cant be established with more than 3 factors
  3. Trigonometrical functions can be analyzed

Physics (5 decks)

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