Quiz
Physical atomic structure chapter
This quiz has question types that open in the usual player.
Questions in this quiz (16)
1The order of magnitude of the diameter of an atom is 10^[blank_start]-10[blank_end] metres.
- A-10
2The actual diameter of an atom ranges from [blank_start]0.1[blank_end]nm to [blank_start]0.5[blank_end]nm
- A0.1
- B0.5
3[blank_start]Atomic force[blank_end] microscopes and [blank_start]scanning tunnelling[blank_end] microscopes can be used to generate images of individual atoms.
- AAtomic force
- Bscanning tunnelling
4You can use an AFM image or a STM image to estimate the diameter of an atom by [blank_start]counting[blank_end] the number of atoms up the side of an image and dividing the true height of the image by it.
- Acounting
5Atomic force microscopes work by [blank_start]dragging[blank_end] a fine needle tip made of [blank_start]silicon nitride[blank_end] across the surface of a specimen. Successive atoms either [blank_start]attract[blank_end] or [blank_start]repel[blank_end] the tip, and the actuator works to keep the [blank_start]force[blank_end] between the needle and the surface constant. This is done using a laser sensor- a laser is shone onto a [blank_start]mirror[blank_end] atop the needle and reflects into a sensor.
- Adragging
- Bsilicon nitride
- Cattract
- Drepel
- Eforce
- Fmirror
6Scanning tunnelling microscopes work by [blank_start]dragging[blank_end] a fine needle tip across the surface of a specimen. A [blank_start]potential difference[blank_end] is applied to the needle tip which causes electrons to tunnel from the specimen surface to the needle tip, and hence a [blank_start]current[blank_end] flows. The actuator works to keep this current [blank_start]constant[blank_end].
- Adragging
- Bpotential difference
- Ccurrent
- Dconstant
7Rayleigh's oil drop experiment can only be used to generate an [blank_start]order of magnitude[blank_end] estimate for the diameter of an atom because of the huge [blank_start]uncertainty[blank_end] in the final value, and because we [blank_start]assume[blank_end] the oil spreads out perfectly across the water surface.
- Aorder of magnitude
- Buncertainty
- Cassume
8In the oil drop experiment, first we coat a tray of water in [blank_start]lycopodium[blank_end] powder. Then we take a loop of copper wire and use it to pick up an oil [blank_start]droplet[blank_end]. We measure the diameter of the oil droplet either directly or by taking a photo. Now we dip the metal loop in the water so an oil slick propagates. We need to measure the diameter of this slick before it [blank_start]contracts[blank_end].
- Alycopodium
- Bdroplet
- Ccontracts
9Derive the equation for the diameter of an atom when using the oil drop experiment. Type done when done. [blank_start]done[blank_end]
- Adone
10The oil drop experiment gives a [blank_start]maximum[blank_end] estimate for the diameter of an atom.
- Amaximum
- Bminimum
11The simplest model of the atom is called the [blank_start]Rutherford[blank_end] model
- ARutherford
12In the Rutherford model, there is a [blank_start]dense[blank_end] nucleus at the centre of the atom made up of [blank_start]protons[blank_end] and [blank_start]neutrons[blank_end], and electrons move around the nucleus in the negative electron [blank_start]cloud[blank_end]. The nucleus makes up the majority of the [blank_start]mass[blank_end] of the atom but a negligible amount of the [blank_start]volume[blank_end].
- Adense
- Bprotons
- Cneutrons
- Dcloud
- Emass
- Fvolume
13The Rutherford model was derived using experimental evidence from the [blank_start]gold[blank_end] foil experiment.
- Agold
14In the gold foil experiment, a [blank_start]thin[blank_end] piece of gold foil was bombarded with [blank_start]alpha[blank_end] particles. It was found that the majority of the particles passed through unaffected but a tiny fraction were [blank_start]deflected[blank_end] through a significant [blank_start]angle[blank_end]. It was concluded firstly that there were well-separated [blank_start]massive[blank_end] particles in the atomic structure and secondly that these particles were [blank_start]positively[blank_end] charged.
- Athin
- Balpha
- Cangle
- Ddeflected
- Emassive
- Fpositively
15The diameter of a nucleus is around [blank_start]100[blank_end]fm. 1fm is equal to 10^[blank_start]-15[blank_end] metres
- A100
- B-15
16The problems with the Rutherford model were: If the electrons were [blank_start]stationary[blank_end] then they would just [blank_start]fall[blank_end] into the nucleus; and if they revolved around the nucleus then they would constantly be [blank_start]accelerating[blank_end] since their velocity [blank_start]vector[blank_end] would constantly be changing direction towards the centre of the orbit so they would constantly [blank_start]radiate[blank_end] energy, lose kinetic energy and spiral into the nucleus.
- Astationary
- Bfall
- Caccelerating
- Dvector
- Eradiate
Information
- Description
- Quiz on Physical atomic structure chapter, created by Dylan Reilly on 29/08/2021.
- Author
- Dylan Reilly
- Language
- English
- Views
- 0
- Rating
- No ratings yet Rate this quiz