Homework 5

For each of the following, which object has more gravitational potential energy?A diver on a 10-meter platform or a diver on a 3-meter diving board

diver on a 10-meter platform

Compared to red light, blue light has higher frequency and

higher energy and shorter wavelength than red light.

Suppose you know the frequency of a photon and the speed of light. What else can you determine about the photon?

its wavelength and energy

A 100-kilogram satellite orbiting Jupiter or a 100-kilogram satellite orbiting Earth. (Assume both satellites orbit at the same distance from their planets' center.)

100-kilogram satellite orbiting Jupiter

What is the wavelength of a radio photon from an "AM" radio station that broadcasts at 1360 kilohertz?

220 m

Which of the following statements best describes the difference between a refracting telescope and a reflecting telescope?

A refracting telescope uses a transparent glass lens to focus light while a reflecting telescope uses a mirror to focus light.

What is its energy?

E = 9.0×10−28 J

Which forms of light are lower in energy and frequency than the light that our eyes can see?

Infrared and radio

Which of the following statements about the force attracting these two galaxies is true?

It is gravity, which operates the same on Earth and in space.

Why is a sunflower yellow

It reflects yellow light

Emission

Light comes from a light bulb Light comes from your computer screen

Choose the correct statement describing, what will you see if you look at them with a telescope that has an angular resolution of 0.5 arcsecond.

One point of light that is the blurred image of both stars.

Rank the forms of light from left to right in order of increasing energy. To rank items as equivalent, overlap them.

RW, infrared, VL, UV, X rays, gamma rays

Reflection or scattering

Red light hits a red sweatshirt White light hits a white piece of paper

We divide the electromagnetic spectrum into six major categories of light, listed below. Rank these forms of light from left to right in order of increasing wavelength. To rank items as equivalent, overlap them.

Shortest to longest Gamma rays, x rays, UV, VL, infrared, RW -> opposite order for lowest to high frequency

Which of the following statements best describes the two principal advantages of telescopes over eyes?

Telescopes can collect far more light with far better angular resolution

The diagram above shows a planet at four positions in its orbit. At which position does it have the greatest angular momentum?

The angular momentum is the same at all four points.

Suppose you watch a leaf bobbing up and down as ripples pass it by in a pond. You notice that it does two full up and down bobs each second. Which statement is true of the ripples on the pond?

They have a frequency of 2 hertz

Absorption

Visible light does not pass through a black wall Blue light hits a red sweatshirt

Transmission

Visible lights meets clear glass Cellphone signals pass through walls

For each of the following, which object has more gravitational potential energy?A bowling ball perched on a cliff ledge or a baseball perched on the same ledge.

bowling ball perched on a cliff ledge

How fast must the candy bar travel to have the same 106 joules in the form of kinetic energy? (Assume the candy bar's mass is 0.3 kilogram.)

v = 2600 m/s