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DAY 2 > GEN PHY > Flashcards

GEN PHY Flashcards

1
Q

What is the momentum of an electron travelling at a speed of 4.25 x 10^3 m/s. The rest mass of the electron is 9.11 x 10^-31 kg.

A

3.87×10 ^−27 kg m/s

Solution:
p=mv
p=(9.11×10 ^−31 kg)×(4.25×10^3 m/s)

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2
Q

A loop of conducting wire with length L and width W is entering a magnetic field B at velocity V. What will be the direction of induced current?

up
down
clockwise
counterclockwise

A

counterclockwise

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3
Q

The electrons moving within a wire can be alternating current (AC) or direct current (DC) to produce electricity. With __________, electrons vibrate back and forth from negative to positive and vice versa.

DC
AC
indirect current
All of these

A

AC

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4
Q

Alternating current, AC transfer more effective than direct current, DC transfer over long distance due to?

very high voltage.
height of power lines.
used of AC generator.
step-up and step-down transformers reducing power loss.

A

step-up and step-down transformers reducing power loss.

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5
Q

The type of LC circuit wherein the flow of current in the +Ve terminal of the circuit is equal to the current through both the inductor L and the capacitor C?

I = IL + IC

Parallel Circuit
Series Circuit
Series Parallel Combination
ALL of these

A

Series Circuit

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6
Q

This illustration shows Beta (B) decay. The atomic number of parent nuclide increases by 1, while the mass number remains the same. In equation form:

Identify the daughter nuclide of Americium (A = 247, Z = 95) undergo ẞ-decay.

247₉₆ Cm
248₉₅ Cm
246₉₆ Cm
247₉₇ Cm

A

247₉₆ Cm

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7
Q

It refers to the ratio of image length to the object length measured in planes that are perpendicular to the optical axis.

A

Linear Magnification

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8
Q

If a virtual image is formed along the principal axis is 25 cm from a concave mirror with the focal length 20 cm, what is the object distance from the mirror?

A

100cm

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9
Q

A man’s face is 17.0 cm in front of a shaving mirror has a focal length of -10 cm.

What type of mirror is being used in the situation?

Concave Mirror
Convex Mirror
Plane Mirror
Spherical Mirror

A

Concave Mirror

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10
Q

A man’s face is 17.0 cm in front of a shaving mirror has a focal length of -10 cm.

How far is the image located?

A

approx. 6.29 cm in front of the mirror

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11
Q

Which diagram on the left shows the path of the light ray above would take as it travels?

*check gc nalang kasi di kaya mag-insert d2

A

B

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12
Q

An object is located somewhere between the focal point (F) and the center of (C) of the mirror. Which best describes the image formed by a concave mirror?

shrunk, erect, and virtual image
magnified, erect, and virtual image
shrunk, erect, and real image
shrunk, inverted, and virtual image

A

magnified, erect, and virtual image

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13
Q

At which position must Princess place her toy in front of a concave mirror to achieve same size, inverted, and real image of the toy?

At the center of curvature
At the focal point
Between the focal point and center of curvature

A

At the center of curvature

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14
Q

What type of converging lens is shown in the illustration?

*check gc

A

di ko alam sagot pero mali ung double convex lens

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15
Q

What is the frequency of an infrared wave if it has a vacuum wavelength of 6.6 μm.

2.20 x 10-11 Hz
2.20 x 10^-13 Hz
4.54 x 10^11 Hz
4.54 x 10^13 Hz

A

4.54 x 10^13 Hz

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16
Q

The relative magnetic permeability of the medium is 3.25 and the relative electrical permittivity of the medium is 1.5. Compute the refractive index of the medium.

A

2.21

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17
Q

Below listed different properties of waves:
I. Polarization
II. Diffraction
III. Refraction
IV. Reflection

Which of these properties also apply to sound waves?

I and II
I, II, and III
II, III, and IV
II only

A

II, III, and IV

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18
Q

Which of the given colors of light has the longer wavelength?

Blue
Green
Violet
Yellow

A

Yellow

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19
Q

The half-life (t₁/₂) of the radioactive substance is the time required for a quantity to reduce to half of its initial value. The half-life of Uranium-232 is 68.9 years. How much of a 100 g samples is present after 248.9 years?

A

10.1 g

solution:
N(t) = N0 x (1/2)^(t/t(₁/₂)
N(248.9)=100×(1/2)^(248.9/68.9)

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20
Q

The part of the eye that has an index of refraction of about 1.336 which is almost the same value as water. What is this thin watery jelly that fills the eye at the back of the lens?

Aqueous Humor
Cornea
Crystalline Lens
Vitreous Humor

A

Vitreous Humor

21
Q

A light ray from a lighthouse travelling in air passed through seawater. Which of the following will likely to happen to the light?

*check gc for picture

A

A

22
Q

It refers to the change in direction of a wave passing from one medium to another caused by its change of speed.

Reflection
Flactuation
Refraction
Index of Reflection

A

Refraction

23
Q

A light ray in air is incident on an air to glass boundary at an angle of 38.0 degrees and is refracted in the glass of 27.0 degrees with the normal. What is the index of refraction of the glass?

A

1.365

Solution:
sin38/sin27

24
Q

Calculate the critical angle of light travelling from quartz (n = 1.46) into air.

A

44.82

Solution:
sin^-1(1/1.46)

snell’s law

25
Q

Which of the following figures represent the Young’s Double Slit Experiment?

*check gc for pic

A

B

26
Q

Which of the following does not affect the frequency of a pendulum?

The weight of the pendulum bob.
The length of the string of the pendulum.
The time it takes the pendulum makes a cycle.
The acceleration of the pendulum movement due to gravity.

A

ewan pero weight sagot niya mali raw

27
Q

Which statement correctly describes the image shown?

Check gc for pic

It is a longitudinal wave with B as its crest.
Transverse wave that has C as its complete cycle.
D is the amplitude while C is the peak-to-peak value.
OC is the magnitude while A is the peak-to-peak value.

A

Transverse wave that has C as its complete cycle. ATA

28
Q

How far away would you see yourself in the plane mirror if you stand 2 feet in front of it?

A

2 feet away in the plane mirror

29
Q

A light ray produced by a sodium lamp has a wavelength of 785 nm (nanometer). Travelling through air, it strikes a smooth, flat slab of crown glass = (nr 1.52) at an angle of 40° to the normal. Find the angle of refraction.

A

25.25

30
Q

It refers to the ratio of the speed of light in a vacuum to the speed of light in that substance.

A

refractive index

31
Q

When the refracted ray moves parallel to the boundary, making the angle of refraction equal to 90°. The angle is called

A

Critical Angle

32
Q

A phenomenon that occurs at the boundary between two mediums, such that if the incident angle in the first medium is greater that the critical angle, then all the light is reflected into that medium.

A

Total Internal Reflection

33
Q

The relativistic expression for kinetic energy is obtained from the work-energy theorem. This theorem states that the network on a system goes into kinetic energy. What is the equation form for this theorem?

A

Wₙₑₜ = KE

34
Q

A photon decays into an electron-positron pair. What is the kinetic energy of the electron if its speed is 2.5 x 10^5 m/s, the mass of the electron at rest is 9.11-31 kg using the equation, KE = Emc^2.

A

66.22×10^−15 J

35
Q

he energy momentum relation is a relativistic equation that relates on object’s rest mass, its total energy, and momentum. From the equation: E = √{(psub2) (csub2) + 2[(msubθ) (csub2)]}, what will happen to energy if the momentum is increase by 2 times?

increase by 2x
decrease by 2x
increase by 3x
decrease by 3x

A

increase by 2x

36
Q

The photoelectric emission could be explained by the

A

Quantum theory of light

37
Q

Which of the following physical properties does not change when speeds of objects approach the speed of light?

Length
mass
time
all will change

A

all will change

38
Q

Which of the following will not hold time for a rocket travelling at a speed of 0.9 c (as observed from earth)?

Clocks will run at a faster rate.
All lengths parallel to the rocket’s direction of motion will be shorter.
The mass of things inside the rocket will seem to increase.
None of the above.

A

None of the above.

39
Q

Five grams ach of the radioactive samples A, B, C, and D were kept separately in a drawer at the same time. Suppose the half-life of A is 2 days that of B is 4 days, C is 6 days and D is 8 days. Which samples has the least amount remaining after 4 days?

A

C

40
Q

What color is the light emitted by hydrogen when an electron makes the transition from energy level 5 to energy level 2?

Red
Blue
Violet
Yellow

A

Blue

41
Q

Which of the following observations from the photoelectric effect is not a violation of classical physics?

Electrons are ejected immediately after impact from light.
Light can eject electrons from a semi-conductive material.
Light intensity does not influence the kinetic energy of ejected electrons.
No electrons are emitted if the light frequency is too low.

A

No electrons are emitted if the light frequency is too low.

42
Q

What is the wavelength for the light to emit photo electrons from the metal surface if it has a work function of 2.3 eV using the equation, W = hc/λ.

A

5.39 x 10^-7 m

43
Q

Now you see a clock through a window on the rocket. Compared to the passage of time measured by the watch on your wrist, you observe that the passage of time on the rocket’s clock is:

shorter
Longer
the same
tripled

A

shorter pero mali raw

44
Q

A photon is reflected from a mirror. which of the following is true that will support the given statement?

Because a photon has a zero mass, it does not exert a force on a mirror.

Although a photon has energy, it cannot transfer any energy to the surface because it has zero mass.

The photon carries momentum, and when it reflects off the mirror, it undergoes a change in momentum and exerts a force on the mirror.

Although the photon carries a momentum, it change in momentum is zero when it reflects from the mirror, so it cannot exert force on the mirror.

A

The photon carries momentum, and when it reflects off the mirror, it undergoes a change in momentum and exerts a force on the mirror.

45
Q

The theory of relativity allow us to calculate the amount of energy “E” that would released if a mass “m” where converted to energy. The famous equation expressing this is which of the following?

E = m times c squared
E = 1/2m times c squared
E = m times c cubed
E = m times c

A

E = m times c squared

46
Q

It is the emission of electrons when electromagnetic radiation falls on an object?

A

photoelectric effect

47
Q

What is an inertial frame of reference?

A

If no external force is acting on a body it will stay at rest or remain in uniform motion

48
Q

Imagine that you are an astronaut who is being paid according the time spent travelling in space as measured by the clock on earth. You take a long voyage travelling at a speed near that of light. Upon your return to earth, your paycheck will be:

smaller than if you had remained on earth.
larger than if you had remained on earth.
same as if you had remained on earth.
you will received no paycheck.

A

larger than if you had remained on earth.

49
Q

You are observing a rocket moving away from you. Compared to its length when it was at rest on ground, you will measure its length to be:

shorter
Longer
the same
tripled

A

shorter pero mali raw

DAY 2 (1 decks)

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