1. An electromagnetic wave in a vacuum has a wavelength of 0.07 m. What is its frequency? (1 point) f = 3.0 • 108 m/s f = 4.3 • 109 Hz f = 3.0 • 109 Hz f = 4.3 • 108 m/s 2. Which of the following occurs as light travels farther from its source? (1 point) Far from the source, photons come together in a small area. The intensity of light increases as photons move away from the source. The source gives off less light as photons move away from it. Far from the source, photons spread over a larger area. 3. Infrared rays have a shorter wavelength than (1 point) ultraviolet rays. X-rays. radar waves. gamma rays. 4. In order of increasing light-transmitting capabilities of materials, which is the correct sequence? (1 point) transparentopaquetranslucent opaquetransparenttranslucent opaquetranslucenttransparent translucenttransparentopaque 5. Which of the following occurs as a light wave bends when it passes from one medium into another? (1 point) constructive interference refraction destructive interference reflection
Which therapy is associated with light, but not sound? a breaking down kidney stones b acoustically targeting the delivery of a drug c cauterizing an incision or wound d ablating tumors
What happens when the temperature of an object increases? A. The particles move closer together. B. The particles move faster. C. The number of particles increases. D. The particles stop moving.
In which of these samples do the molecules most likely have the most kinetic energy? solid ice at −5°C ice water at 0°C liquid water at 98°C water vapor at 150°C
Which force best represents Fg? a. A weight lifter is pushing a barbell upward with a force of 90 N. b. The weight of a barbell acting on a weight lifter is 80 N. c. The amount of upward force of a table on a box is 25 N. d. A box on a rough table has difficulty sliding past 25 N of force.
Most of uranus's atmosphere is composed of a. helium and hydrogen. b. oxygen and nitrogen. c. carbon dioxide and methane. d. nitrogen and hydrogen.
A force of 11n is applied to the handle of a screw driver being used to pry off the lid of a paint can. what is the efficency of the screw driver.
Which of the following is the best example of potential energy? Question 1 options: a ball sitting at the top of a hill a ball sitting at the bottom of a hill a ball rolling down a hill Save Question 2 (1 point) Question 2 Unsaved Which of the following is an example of kinetic energy? Question 2 options: a girl running in a race a car sitting motionless a tank containing gasoline a sled sitting at the top of a hill Save Question 3 (1 point) Question 3 Unsaved The water held by a dam is an example of which type of energy? Question 3 options: kinetic energy chemical energy electrical energy potential energy Save Question 4 (1 point) Question 4 Unsaved What does the kinetic theory explain? Question 4 options: Heat is due to Pascal´s principle. Heat is due to temperature. Heat is due to potential energy. Heat is due to the motion of molecules. Save Question 5 (1 point) Question 5 Unsaved If the atoms and molecules of a substance are moving very fast, the substance is __________. Question 5 options: porous cold hot frozen Save Question 6 (1 point) Question 6 Unsaved Heat energy is measured indirectly by __________. Question 6 options: temperature kinetics recording the motion of molecules Save Question 7 (1 point) Question 7 Unsaved What are the ways that heat moves? Question 7 options: Heat only moves through air currents. Heat moves through conduction, convection, and radiation. Heat only moves through conduction and radiation. Heat moves from a cold object to a warm object. Save Question 8 (1 point) Question 8 Unsaved Convection requires __________ to transfer heat. Question 8 options: the vacuum of space fluids (liquids or gases) insulation solids Save Question 9 (1 point) Question 9 Unsaved What does an insulator do? Question 9 options: An insulator slows heat transfer. An insulator cools a substance. An insulator warms a substance. An insulator emits electromagnetic radiation. Save
A glob of sticky putty is thrown against a slightly open door so that it sticks on impact and gives the door a momentum of 1.4 kg m/s. A rubber ball with exactly the same mass and velocity as the sticky putty strikes the door and bounces back at its initial speed in the opposite direction. What impulse does it impart to the door? 2.8 kgm/s 1.4 kgm/s 0.70 kgm/s 0 kgm/s
What causes a bolt of lightning? A. Electrical charges build up in the clouds only. B. Electrical charges build up on the ground only. C. Electrical charges build up in the clouds and on the ground. D. Electrical charges build up in the space between the clouds and the ground.
Water at the top of a slope has potential energy. please select the best answer from the choices provided: t f
Which of the following best describes a plane? a. The surface of a flat table B. The edge of a desk C. A curve in a road D. The point of intersection of two walls
Which of the following is true about glass recycling? a. Recycling glass reduces the rate of deforestation. b. Recycling glass eliminates greenhouse gas emissions. c. Recycling glass is an energy-saving practice. d. Recycling glass has an incredibly short turn around time.
When a pot of water is put on a stove, the water at the top gets hot primarily by ____. a. radiation c. convection b. conduction d. condensation Certain materials can become superconductors under what conditions? a. When it is very hot c. Under very high pressure b. When it is very cold d. Under very low pressure
Which statement best describes how waves carry energy? A.Energy moves from one place to another through the wave. B.Energy increases as it moves through the wave. C.Energy is completely consumed by the beginning of the wave. D.Energy builds through the wave and is released at the end.
According to newton's second law of motion, force is equal to mass times acceleration. true or false.
How does an insulator stop the flow of an electric current? A. Insulators have a positive charge, so they absorb electrons. B. Insulators do not allow electrons to move easily through them. C. Insulators convert electric energy to other forms of energy. D. Insulators have too many electrons.
Use the following photoelectric graph to answer the following question: Graph titled Photoelectric Effect for a Photomissive Metal is shown. The y axis is labeled kinetic energy and scales from negative 2 to positive 4 electron volts. The x axis is labeled frequency from 0 to 11 times 10 to the 14 hertz. A straight line connects the points 0, negative 1.2 and 5.5, 1 and 9, 2.5. If you use a different experimental photo-missive material, what would be the same on the graph? A The y-intercept B The intercept C The slope
Study Figure 10-3. How much nitrogen-14 will be produced from a 200-g sample of carbon-14 after 17,190 years?Download png
The available source of charge that pushes a charge through a circuit is A. resistance. B. voltage. C. alternating current. D. direct current.
Which one of the following is not an example of a combination reaction a. 2H2O(I)---> 2H2(g)+O2(g) b. 2K+CI2--->2KCI c. 2H2+O2--->2H2O d. 2Mg+O2--->2MgO
What technology helped propagate consumerism and uniformity of American life in the 1950s?. .A. AM radio. . B.computers. . C.television. . D.the transistor. .
A conglomerate is a rock that forms as a result of _____. . . Choices:Intense heat and pressure. Compaction and cementation. Rapid cooling. Slow cooling.
What compound name belongs in box (1) in Figure 3? What type of bond belongs in box (3) in Figure 3? Download png
Rainforest deforestation generally has a positive impact on indigenous tribes and peoples. Please select the best answer from the choices provided T F
According to MyPlate, you should eat approximately two and a half cups of vegetables per day. Please select the best answer from the choices provided. T F
In a typical rear-end collision, the victim's ________ is/are accelerated faster and harder than the torso