The doppler effect is the change in observed frequency due toa. the type of medium the wave is in
b. the type of wave
c. the original frequency of the source
d. the motion of the source or observer

Answers

Answer 1

Answer: d. the motion of the source or observer

Answer 2

Answer:

I believe the answer is D, im not 100% sure though.

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Which of the following is not an example of work?A. raising a barbell over your head

B. picking up a box off the floor

C. holding a tray in the cafeteria line

D. pushing a box across the floor

Answers

The following which is not an example of work is C. holding a tray in the cafeteria line because if force displaces an object it should work. I think it's clear and I am pretty sure this answer will help you.

the atomic mass of potassium is 39. if its atomic number is 9, it has how many neutrons within each potassium atom?

Answers

Atomic number is actually 19 as it has 19 protons. To make up the mass number of 39 it needs 20 more nucleons, these must come in the form of neutrons so it has 20 neutrons.

What color do you think an object would be if it reflected all colors of the visible spectrum? A.The object would be black.

B.The object would be yellow.

C.The object would be white.

D.The object would be blue.

Answers

c) The object would be WHITE.

We call "white light" to the sunlight, but referred to the visible part of spectrum. If the object reflects all the light, it appears as a white object.

Projectile motion is a combination of which two types of motion?

Answers

The correct answer is:

Vertical Free Fall and Constant Horizontal Motion

Explanation:

A projectile proposal is a form of motion confronted by an object or particle that is started near the Earth's surface and transfers along a rounded path under the action of gravity only. The vertical force acts perpendicular to the parallel motion and will not affect it since perpendicular segments of motion are confident of each other. Thus, the projectile travels with a constant horizontal velocity and a descending vertical acceleration.

Vertical Free Fall and Constant Horizontal Motion

The discovery of photons is an example of which aspect of electromagnetic radiation?a) wave behavior

b) particle behavior

c) interference

Answers

Answer: Particle Behavior

Explanation:

Answer:

Particle Behavior

Explanation:

I did Gradpoint :)

The statement "force equals mass times acceleration (F = ma)" is Newton's second law of motion. Why is this a law rather than a theory?Options:
a) It has been extensively tested and confirmed through experimentation.
b) It is a hypothesis that is yet to be proven.
c) It is a general explanation for a wide range of phenomena.
d) It is based on mathematical equations but lacks empirical evidence.