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6th Grade Academic Pentathlon 2019 Science-Lasers

Total questions: 50

Worksheet time: 50mins

Name
Class
Date
1.

Which of the following types of electromagnetic radiation has the shortest wavelength?

a)

Infrared Light

b)

Radio Waves

c)

Visible Light

d)

X-Rays

e)

Gamma Rays

2.

Which of the following statements about photons are true?

a)

A photon has a small but measurable mass.

b)

The speed of a photon is proportional to its frequency.

c)

The energy of a photon is proportional to its frequency.

d)

Photons have zero momentum.

e)

Photons cannot be described in waves.

3.

Which of the following is NOT an electromagnetic wave?

a)

Microwaves

b)

Sound Waves

c)

X-rays

d)

Visible Light

e)

Radio Waves

4.

Which of the following statements about light is TRUE?

a)

Light has properties of neither particles nor waves

b)

Light can be described exclusively as a particle.

c)

Light can be described exclusively as a wave.

d)

Light exhibits properties of both particles and waves.

e)

There is always a 50/50 chance of light being measured as a wave or a particle.

5.

Which of the following lasers are commonly used for surgical procedures due to their 10.6um wavelength?

a)

Excimer Lasers

b)

Carbon Dioxide Lasers

c)

Ruby Lasers

d)

Diode Lasers

e)

Nd: YAG Lasers

6.

An atom emits a photon when one of its orbital electrons

a)

moves from a higher to a lower energy level

b)

moves from a lower to higher energy level

c)

is completely removed from the atom

d)

becomes thermally excited

e)

is ejected from a metal surface

7.

In a photoelectric effect experiment, suppose that ultraviolet light was observed to eject electrons from a metal surface. Which of the following types of radiation would definitely eject electrons from the same surface?

a)

Microwve

b)

Infrared

c)

X-ray

d)

Visible light

e)

Radio

8.

Which of the following is a common use for laser pointers?

a)

to highlight certain items in a presentation

b)

as part of surveying equipment

c)

as part of a guidance system for robots

d)

as part of a light show at entertainment venues

e)

all of the above

9.

If an atom of boron has 5 protons and 6 neutrons, how many electrons must it have?

a)

5

b)

6

c)

10

d)

11

e)

Cannot be determined from this information

10.

According to the Bohr model, electrons can move to higher energy levels. Which of the following would be the best analogy?

a)

walking up a ramp

b)

stretching a rubber band

c)

diving underwater

d)

changing lanes on a road

e)

stepping up a staircase

11.

What is the term for the number of oscillations per unit of time of any wave or repeating event?

a)

Spacing

b)

Frequency

c)

Wavelength

d)

Period

e)

Separation

12.

Optical tweezers rely on the fact that photons have

a)

Mass

b)

Charge

c)

Momentum

d)

Heat

e)

Color

13.

What is light composed of?

a)

air molecules

b)

charged particles

c)

oscillating electric fields

d)

oscillating magnetic fields

e)

electric and magnetic fields oscillating together

14.

Not all neon lights actually contain neon gas. True neon lights are what color?

a)

red

b)

blue

c)

reddish-orange

d)

green

e)

yellow

15.

Charles Townes' original method for producing stimulated emission used what type of electromagnetic waves?

a)

Radio waves

b)

Microwaves

c)

visible light

d)

Ultraviolet

e)

X-rays

16.

Which of the following laser techniques have been used to measure the elasticity of DNA?

a)

confocal laser scanning microscopy

b)

laser cooling

c)

laser-induced fusion

d)

optical tweezers

e)

photolithography

17.

Which of the following statements about photoelectric effect is TRUE?

a)

X-rays are necessary to produce the effect.

b)

It takes several minutes for electrons to be emitted from a metal surface.

c)

Higher frequency light causes electrons to be emitted with greater energy.

d)

Increasing the intensity of the light always causes more electrons to be emitted.

e)

It can only be explained with the wave model of light.

18.

Which of the following is TRUE regarding electromagnetic waves?

a)

All electromagnetic waves travel at the speed of light.

b)

All electromagnetic waves travel at the speed of sound

c)

The speed of electromagnetic wave depend on its frequency.

d)

The speed of electromagnetic wave depend on its temperature.

e)

Each electromagnetic wave has a unique speed.

19.

Which of the following statements about Planck's constant is TRUE?

a)

It remains unknown to this day.

b)

It relates the energy of a photon to its frequency.

c)

It is not truly constant because it varies from one region of the universe to another.

d)

It is commonly expressed in units of seconds.

e)

It is equal to the energy of a single photon.

20.

A standard incandescent light bulb typically converts about how much of the energy it consumes into visible light?

a)

95% or more

b)

75%

c)

50%

d)

25%

e)

5% or less

21.

The lowest allowable energy state of an atom is known as what?

a)

Ground State

b)

Ionization energy

c)

Absolute zero

d)

Critical state

e)

Base Level

22.

How can lasers remove tattoos from skin?

a)

By burning away skin cells containing tattoo ink.

b)

By chemically changing tattoo ink so that it becomes invisible.

c)

By breaking down the molecules that make up the ink.

d)

By changing the color of tattoo ink to match the surrounding skin.

e)

Laser tattoo removal is not currently possible.

23.

The idea that emitted light can serve as a "fingerprint" to identify the atoms within a sample is the basis for what technique?

a)

Radiometric dating

b)

Photoelectric effect

c)

Inertial confinement

d)

Atomic spectroscopy

e)

Mass spectrometry

24.

In what year did Max Planck propose his quantum hypothesis?

a)

1704

b)

1808

c)

1887

d)

1900

e)

1921

25.

The National Ignition Facility is a research center focused on what?

a)

Nuclear Fusion

b)

Laser Cooling

c)

LASIK

d)

Atomic Spectroscopy

e)

Optic Tweezing

26.

The first laser operated at what wavelength?

a)

532nm

b)

694nm

c)

755nm

d)

800nm

e)

1064nm

27.

During his investigation of the photoelectric effect, Philipp Lenard observed that if light of a certain frequency did not eject electrons from a metal, then increasing the intensity of the light...

a)

had no effect.

b)

caused electrons to be ejected.

c)

produced sparks.

d)

caused the light to change color.

e)

oxidized the illuminated metal

28.

How was helium first detected in 1868?

a)

as a product of nuclear reaction

b)

as a product of chemical reaction

c)

through a chemical analysis of an atmospheric sample

d)

as part of a drilling operation

e)

through atomic spectroscopy of the Sun

29.

Which scientific idea explains the "stacking" property of electrons in an atom?

a)

the Pauli Exclusion Principle

b)

the de Broglie hypothesis

c)

the photoelectric effect

d)

the correspondence principle

e)

Planck's law

30.

If the frequency of a wave is 2 Hz, what is its period?

a)

2 s

b)

1 s

c)

0.5 s

d)

0.2 s

e)

There is not enough information to determine.

31.

Which of the following represents the single largest application for excimer lasers?

a)

Laser pointers

b)

Holography

c)

Stereolithography

d)

Semiconductor fabrication

e)

Barcode readers

32.

LASIK surgery involves using lasers to reshape which part of the eye?

a)

Pupil

b)

Iris

c)

Lens

d)

Cornea

e)

Retina

33.

Which type of laser is best suited for use in a CD/DVD player?

a)

gas laser

b)

laser diode

c)

solid-state laser

d)

excimer laser

e)

maser

34.

In what year was the first laser barcode reader used?

a)

1962

b)

1968

c)

1974

d)

1985

e)

1992

35.

As a wave travels between two points in a medium, it transfers

a)

energy only

b)

matter only

c)

both energy and matter

d)

neither energy or matter

e)

The answer depends on whether the wave is mechanical or electromagnetic

36.

In what year was the LASIK procedure approved in the United States?

a)

1974

b)

1985

c)

1992

d)

1999

e)

2007

37.

Which of the following is NOT true regarding laser hair removal?

a)

Near-infrared light is commonly used.

b)

It is more difficult to remove light colored hair than dark colored hair.

c)

Laser light is absorbed by melatonin in the hair.

d)

Different lasers may be used for different skin and hair combinations.

e)

The treatment is more effective if the hair and skin are very similar in color.

38.

Glow in the dark toys are an example of

a)

Incandescence

b)

Fluorescence

c)

Phosphorescence

d)

Holography

e)

None of the above

39.

Who originally proposed the concept of stimulated emission?

a)

Charles Townes

b)

Max Planck

c)

Albert Einstein

d)

Willis Lamb

e)

Gordon Gould

40.

What is the purpose of the laser in a laser printer?

a)

To burn an image onto the paper

b)

To electrically charge the paper so that it will attract toner particles.

c)

To transmit the image to b printed from the computer to the printer.

d)

To determine how much ink is left in the printer.

e)

To correct printing errors by breaking up ink molecules.

41.

Which scientist proposed an experiment to measure the speed of light involving lanterns at a great distance?

a)

Galileo Galilei

b)

Isac Newton

c)

Ole Romer

d)

Hippolyte Fizeau

e)

James Maxwell

42.

In which of the following techniques is a three-dimensional object "built" by using a laser to solidify a liquid?

a)

Photolithography

b)

Stereolithography

c)

Holography

d)

Laser etching

e)

Selective laser sintering

43.

Atoms that gain or lose electrons are known as

a)

Photons

b)

Positrons

c)

Molecules

d)

Ions

e)

None of the above

44.

Which of the following data storage formats are read using the longest wavelength laser?

a)

CD

b)

DVD

c)

HD DVD

d)

Blu-ray

e)

These formats are all read using the same wavelength laser.

45.

Which of the following was invented by Gary Starkweather?

a)

Laser cooling

b)

Optical Tweezers

c)

LaserDisc format

d)

Holography

e)

Laser Printing

46.

The fact that a hot stove coil glows red can be explained by

a)

Phosphorescence

b)

Fluorescence

c)

Spectroscopy

d)

Incandescence

e)

Rayleigh scattering

47.

Which of the following is NOT true regarding laser welding?

a)

The material must be fitted together precisely, with little room between them.

b)

The laser beam must penetrate the entire thickness of the material

c)

The materials to be welding must be identical.

d)

The farther the mid-point of the weld, the less the heat affects the metal.

e)

Both CO2 and Nd: YAG lasers are commonly used for welding.

48.

The "A" in laser stands for what?

a)

anomalous

b)

amplification

c)

atomic

d)

antenna

e)

none of the above

49.

When illuminated by white light, an apple appears red and its leaves appear green. When illuminated by green light, the apple will appear

a)

red

b)

green

c)

white

d)

black

e)

blue

50.

Which of the following is NOT a common medical use for lasers?

a)

tattoo removal

b)

vision correction

c)

hair removal

d)

gum disease treatment

e)

hair restoration

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