8th grade science

I'm not sure what's the correct answer:

9)Which of these characteristics can only be attributed to a wave of red light?
A)The energy of the wave travels in the same direction as the wave travels.
B)The wave travels by vibrating the particles of the medium at a high rate.
C)The wave travels by compressing and expanding the medium it travels through.
D)The energy of the wave moves perpendicular to the direction the wave travels.

Ans: D

11) In which medium would sound travel the fastest?
A)across a room
B)in a swimming pool
C)through outer space
D)through a railroad track

Ans: A
12) Why do electromagnetic waves not require a medium for travel?
A) because electromagnetic waves travel too fast for stationary particles to move with them

B) because electromagnetic waves transmit energy without compressing the particles of the medium

C) because electromagnetic waves generate their own particles for compression and use these for movement

D) because electromagnetic waves move in two-dimensional space, the particles of mediums exist in 3-D space


asked by Alexis
  1. wrong, wrong, B.
    the first two, look at a, b.

    posted by bobpursley

Respond to this Question

First Name

Your Response

Similar Questions

  1. PE

    1. the period development of which a child develops into an adult is called? a. childhood process b. adolescences c. teen years d. blooming ( i think this is the answer) 2.characteristics caused by hormones but that do not include
  2. Art

    Which of the best definitions of personification? Giving animals and objects human characteristics•• Developing new characteristics of Personality Giving yourself the characteristics of someone else Giving human
  3. biology

    Are an organism's characteristics determined only by its genes? Explain. Yes, an organism's characteristics are determined only by It's genes becuase the parents give their offspring genes which determines their characteristics.
  4. Health

    Characteristics caused by hormones but that do not include development of reproductive organs are called........ A. primary sex Characteristics B. secondary sex characteristics*** C. physical Characteristics D. body
  5. Health

    Characteristics caused by hormones but that do not include development of reproductive organs are called........ A. primary sex Characteristics B. secondary sex characteristics C. physical Characteristics D. body Characteristics
  6. Biology I

    Each level of classification is based on: general characteristics, or shared characteristics, or general characteristics & shared characteristics & specific characteristics. Thanks
  7. science

    Characteristics of Living Organisms Ten characteristics distinguish an object or thing from an actual living organism. All 10 characteristics must be present simultaneously for something to be considered living. The following
  8. Art

    The statue, Bodhisattva Padmapani, (search on yah oo, and go to the first website listed to see a picture of it) I need to write what expression he gives off, and 4 characteristics. Characteristics - Broad face, Elongated eyes,
  9. Art

    which of the following would be the best criterion for evaluating this piece of art? (1 point) A. the characteristics of detailed portraits. B. the characteristics of perspective. C. the characteristics of photo-realism. D. the
  10. biology

    What are the general characteristics of all vertebrates? A. Include several animal phyla. B. Have a backbone or spinal column. C. Lack cephalization. D. Include all chordates. my answer is B is that correct

More Similar Questions