# Test: Question Preview (ID: 25536)

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**Which of the following behaviors of light provides evidence for its wave nature?**

a) Light will travel indefinitely in a straight line until it strikes an object.

b) Light striking a flat surface at an angle is reflected at the same angle.

c) Two beams of light that meet can create interference with each other.

d) The amount of energy in a beam of light can be measured and calculated.

**A ___________________________ is a discrete unit (quantum) of light energy.**

a) work

b) photon

c) Planck

d) wavelength

**If radiation has a frequency of 3.0 X 10^15 Hz and it strikes a material, what is the energy of each incident photon (Planck’s constant is 6.6 X 10^-34)?**

a) 1.98 x 10-18

b) 1.23 x 10^23

c) 5.6 x 10^6

d) 7.3 x 10^-7

**If the frequency of light is 5.34 X 10^14 Hz, calculate the energy of the photon (Planck’s constant is 6.6 X 10^-34).**

a) 3.56 x 10^-7

b) 1.23 x 10^23

c) 1.98 x 10^-18

d) 3.5244 x 10^-19

**What is the Value of Planck's constant?**

a) 6.67 x 10^-11 Js

b) 6.67 x 10^-19 Js

c) 1.6 x 10^-19 Js

d) 6.63 x 10^-34 Js

**What is E = hf ?**

a) Formula for frequency and the speed of light

b) Wavelength and frequency

c) Einsteins formula for the energy of a photon

d) De Broglie wavelength formula

**Charge of an UP quark?**

a) 1/3

b) -1/3

c) 2/3

d) -2/3

**What distance is an angstrom?**

a) 10^-5 m

b) 10^-10 m

c) 10^-15m

d) 10^-20 m

**What distance is a femtometre?**

a) 10^-5 m

b) 10^-10 m

c) 10^-15 m

d) 10^-20 m

**What is the speed of light?**

a) c = 3.00 x 10^18 m/s

b) c = 3.00 x 10^9 nm/s

c) c = 3.00 x 10^8 nm/s

d) c = 3.00 x 10^8 m/s

**Whats the charge of a down Quark?**

a) 1/3

b) 2/3

c) -1/3

d) -2/3

**E =**

a) hc

b) mp

c) fλ

d) hf

**Physicist Thomas Young created the __________ to demonstrate the wave like properties of light.**

a) Shadow Box Experiment

b) Cat in the Box Experiment

c) Double-Slit Experiment

d) Wave-Pool Experiment

**What is the unit of measurement for Planck's constant**

a) Joules

b) Joules per second

c) Joule seconds

d) Coulombs

**What is the unit of measurement for Electromagnetic Charge?**

a) Joules

b) Coulombs

c) Joule Seconds

d) Hz

**What is an electron orbital?**

a) The work function of a quark

b) The shape in which an electron perfectly orbits a nucleus

c) 3-D shapes defining 90% probability region where electrons may be at any given energy state

d) There's no such thing

**In some situations, when a beam of light is directed at a metal surface, an electron is emitted. This happens because the photons in the light -**

a) combine with metal atoms to create electrons, which escape

b) are transformed into electrons with enough energy to escape.

c) transfer their energy to an electron, helping the electron escape.

d) are destroyed on impact, generating electrons which escape.

**The deBroglie wavelength theory equation....**

a) Not even real

b) is used to calculate the energy of a Photon E = hf

c) E=mc^2

d) is used to calculate wavelength of matter, λ = h/p or λ = h/mv

**As a photon strikes a piece of metal, the kinetic energy of an ejected electron is determined by -**

a) the frequency of the absorbed photon.

b) the number of absorbed photons.

c) the path taken by the escaped electron.

d) the mass of the escaped electron.

**A beam of light is directed onto a sheet of metal, but electrons are not ejected from the metal. Increasing which of the following could possibly cause the metal to begin to eject electrons?**

a) Frequency

b) Wavelength

c) Intensity

d) Speed

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