The ratio of the circumference of any circle to its diameter is . Similarly, the ratio of the energy of any photon to its frequency is
1) h, Planck's constant,
2) uncertain, unlike ,
3) the wavelength of the photon,
4) c, the photon's speed,
which is
5) a basic constant of nature setting a lower limit on the smallness of things.
6) a basic constant of nature setting an upper limit on the speed of things.
[Ques. 2] The thing that is different between x-rays and radio waves is
1) their charges,
2) their masses,
3) their frequencies,
4) the medium through which they travel,
5) the speeds at which they travel,
and the thing that is the same for x-rays and radio waves is
6) their masses.
7) their frequencies.
8) the medium through which they travel.
9) the speeds at which they travel.
10) none of these.
[Ques. 3] The radiation curve is a plot of light intensity versus frequency for an incandescent source. If this light is first passed through a cool gas, the resulting radiation curve would most probable look like
1) I.
2) II.
3) III.
This best illustrates that the atoms of gas have
4) been excited.
5) absorbed part of the light.
6) simplified selective frequencies of the transmitted light.
[Ques. 4] The radiation curve is a plot of light intensity versus frequency for an incandescent source such as a glowing lamp filament. If the source of light were excited atoms in the gaseous phase, the radiation curve would look like
1) I.
2) II.
3) III.
4) IV.
The plot shown in IV is of
5) monochromatic light.
6) a very bright source.
7) light that has passed through a thin slit.
[Ques. 5] Light from a laser is
1) monochromatic.
2) in phase.
3) coherent.
4) all of the above.
Compared to the energy put into a laser, the energy of the laser beam is
5) usually much more.
6) much less.
7) the same.
[Ques. 6] The diagram is of a simple spectroscope. If lens 1 were omitted, the resulting spectrum would be
1) much dimmer.
2) upside down.
3) no different.
If, instead, the slit were opened too wide, the middle of the spectrum would appear
4) white.
5) much narrower.
6) black.
7) a broader yellow.
[Ques. 7] A pinhole cameras has no lens. The tiny pin-hole opening insures that rays of light from different parts of an object
1) overlap.
2) don't overlap.
3) bend to a focus.
Small openings between leaves in a tree act as pinholes. The round spots of light cast on the ground below are images of
4) the Sun.
5) the openings themselves.
6) both of these
7) neither of these
[Ques. 8] Light passes readily through a pair of Polaroids when their axes are
1) parallel.
2) perpendicular.
3) neither of these,
and for a pair of Polaroids with axes at 45 degrees to each other
4) light will not pass.
5) light that passes is dimmer than for parallel Polaroids.
6) another Polaroid is necessary for any light to pass.
[Ques. 9] If the sky were ordinarily yellow-orange instead of blue, then sunsets would appear
1) orange,
2) green,
3) blue,
4) black,
which has to do with
5) the polarization of sunlight.
6) yellow-orange and sky blue being complementary colors.
7) the refraction of sunlight through the thicker atmosphere.
[Ques. 10] Rainbows exist because light in water drops is
1) reflected.
2) refracted.
3) both of these
And the main reason drops disperse different colors involves light's different
4) frequencies.
5) speeds.
6) directions.
7) energies.
Quick Reply
