It is true that no photoelectrons are released when ultraviolet radiation strikes a surface.
Which metal only emits electrons in response to UV light?It was discovered that certain metals, such as zinc, cadmium, magnesium, etc., only emitted electrons from their surfaces when exposed to ultraviolet light with a short wavelength. Lithium, sodium, potassium, caesium, and rubidium are examples of alkali metals that can be sensitive to visible light.
Why don't photoelectrons release?If the frequency of the light is less than a specific level, no photoelectrons are released. The threshold frequency is referred to as such. For many materials, the threshold frequency varies. Alkali metals, calcium, and barium lose their photoelectron content when exposed to visible light.
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Does the eruption from a volcano represent force
Answer:
Yes, because of the force of gas exploding the volcano from pressure is a force.
QUESTION
Energy can only be used in it's original
form.
false
true
Answer:
False
Explanation:
Energy keeps on converting from one form to another and it is useful in each of its forms.
For instance, the kinetic energy get converts into potential energy, mechanical energy of motor converts into electrical energy, sound energy (phone) converts into electrical energy etc. but in all these forms energy is useful in one or the other way.
Hence, the given statement is false.
Ways that waves may interact with matter include
Answer:
Three ways that waves may interact with matter are reflection, refraction, and diffraction. Reflection occurs when waves bounce back from a surface that they cannot pass through.
Thomas helps his older brothers, who own a junk yard, on the weekends to earn extra money. He likes to help them push broken-down cars to the back of the junk yard because it makes him feel strong. Last Saturday, they pushed three cars with different weights, and he noticed he used different amounts of force for each one. The cars were the following weights:white car: 2,700 poundsred car: 1,500 poundsblue car: 2,100 poundsThink about how much force is needed to move each car. Which correctly organizes the cars in order from the most to least amount of force needed to move them
Answer:
white, blue and red
Explanation:
Force is given by
[tex]F=ma[/tex]
where
m = Mass of object
a = Acceleration of the object
If the acceleration is same for all the cars the force needed to be applied will depend on the mass of the car. The heaviest car requiring the most force and the lightest car requiring the least amount of force.
Here, the weight of the cars in descending order is white, blue and red.
So, the cars in order from the most to least amount of force needed to move them is white, blue and red.
You observed the wheels of a car as it moves past you from right to left. Do the wheels have a positive or negative angular velocity?
Answer:
Negative angular velocity
Explanation:
The movement/rotation of An object in a clockwise direction ( right to left direction) corresponds to a Negative angular velocity . while the rotation of an object in an anti-clockwise direction ( left to right direction ) possess a positive angular velocity.
Hence the movement of the wheels of the car past you from right to left will possess a Negative angular velocity
Which would use more energy, a 50-watt bulb or a 75-watt
bulb left on for the same amount of time?
Answer: 75-watt bulb
How are the surface of Mercury and Mars similar to the surface of the Earth?
Answer:
The terrestrial planets all have rocky surfaces that feature mountains, plains, valleys and other formations. ... Mars has very low atmospheric pressure, and Mercury has almost none, so craters are more common on these planets.
Explanation:
Definition: The energy transferred by a force to a moving object.
Answer:
Force applied
Explanation:
An object will remain at its state of rest unless a non zero for act on it
how do you select the appropriate tools for caregiving rated task effectively?
Answer:
Care giving tools like medical devices or any medical supplies which aid the effectiveness of care for the patient will help the quality of work of care giving. ... All of the care giving tool should also be efficient and effective
If you had pulled the box with 300W of power, and did 900J of work, how long did it take to pull the box?
Answer: 3 seconds
Explanation:
The equation for Power is P=W/tΔ
P= Power(W)
W= Work(J)
t= change in time
So for this equation we have 300=900/t where we need to solve for t which we can do by using algebra
300=900/t
t=900/300
t=3
so t= 3 seconds (s)
Which one i need help
Answer:
C
Explanation:
A car drives for 50 seconds and travels 2 meters what is its velocity
Speed = (distance) / (time)
Speed = (2 m) / (50 s)
Speed = 0.04 m/s
There's not enough information to state the car's velocity. We don't know anything about the direction it moved.
change 60cmHg to Pascal
Answer:
7980Pa
Explanation:
1cmHg = 133Pa
60cmHg = 7980Pa
Which of these statements are true about hydroelectric power? A.It is the most widely used renewable energy source in the world. B.It never disrupts ecosystems. C.It is not always available. D.A hydroelectric dam controls the force of moving water to generate electricity.
takes 5 seconds and 2,000 J for a crane to lift a very heavy object. Which of these correctly describes power and energy for this action?
2,000 J of energy was converted into some other energy, requiring 10,000 W of power.
2,000 J of energy was converted into some other energy each second, requiring 400 W of power
2,000 J of power was converted into 400 W of energy.
2,000 J of power was converted into some other power every second, requiring 10,000 W of energy.
A crane takes 5 s and 2,000 J to lift an object. That is, 2,000 J of energy was converted into some other energy each second, requiring 400 W of power.
What is power?In physics, power is the amount of energy transferred or converted per unit time.
A crane uses 2,000 J of energy (E) to perform work (W) is 5 s (t). Let's calculate the power used (P).
P = W / t = 2,000 J / 5 s = 400 W
Which of these correctly describes power and energy for this action?
2,000 J of energy was converted into some other energy, requiring 10,000 W of power. No, the required power was 400 W.2,000 J of energy was converted into some other energy each second, requiring 400 W of power. Yes.2,000 J of power was converted into 400 W of energy. No, energy cannot be converted into power.2,000 J of power was converted into some other power every second, requiring 10,000 W of energy. No, the required power was 400 W.A crane takes 5 s and 2,000 J to lift an object. That is, 2,000 J of energy was converted into some other energy each second, requiring 400 W of power.
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Activity
Launch the Wave on a String simulation again to investigate the relationship between amplitude and damping force.
To begin:
• Select Oscillate and No End.
• Set Amplitude to 1.00 cm and Frequency to 1.00 Hz,
• Set Damping to None and Tension to low.
• Select Rulers to measure the amplitude of the waves.
For each measurement described below, pause the wave when the oscillator arm is at or just past its maximum
Part A
You can see that each wave has a crest and a trough. Measure the amplitude at the first crest to the center of the ball and record your reading in
the table below. Record amplitude measurements for every subsequent trough and crest, as identified in the table.
Finally, vary the Damping as indicated in the table and record your amplitude readings again for each different damping value to complete the
table. Each division is 5 units of dampening force, where None = 0, and Lots = 50.
illustration
Amplitude of Wave 1 E Amplitude of Wave 2 Amplitude of Wave 3
(crest)
(crest)
(crest)
In the early universe and now, stars most likely formed from which of the following?
Group of answer choices
Nebulas
Planets
Comets
Asteroids
Answer:
Nebulas
Explanation:
Nebulae are made of dust and gases—mostly hydrogen and helium. ... Eventually, the clump of dust and gas gets so big that it collapses from its own gravity. The collapse causes the material at the center of the cloud to heat up-and this hot core is the beginning of a star.
(b) The refractive index of the glass of the prism is 1.49. The ray EF is refracted at F. Use
information from Fig. 6.1 to calculate the angle of refraction at F.
IL
angle of refraction
[3]
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Distance time graphs
Answer:
A distance-time graph shows how far an object has travelled in a given time. It is a simple line graph that denotes distance versus time findings on the graph. Distance is plotted on the Y-axis. Time is plotted on the X-axis
Explanation:
According to the graph, at which time during a sunny summer day are the
particles in a swimming pool likely to be moving the most quickly?
A. 6:00 p.m.
B. 11:00 p.m.
C. 5:00 a.m.
D. 8:00 a.m.
Answer: A 6:00 pm
Explanation: took the exam
What type of circuit is pictured?
O Parallel Circuit
Series Circuit
Answer:
Parallel Circuit
Explanation:
Check the image below
in series circuits currents can only flow in one direction
In parallel circuits currents can flow through more than one path
Because the circuit shown has two pathways it is considered a parallel circuit
Answer:
Parallel Circuit
Explanation:
Hope this helps
A toy gun uses a spring to shoot plastic balls (m = 50 g). The spring is compressed by 3.0 cm. Let k=2.22 × 105 N/m. (a) Of course, you have to do some work on the gun to arm it. How much work do you have to do? (b) Suppose you fire the gun horizontally. How fast does the ball leave the gun? (c) Now suppose you fire the gun straight upwards. How high does the ball go?
Answer:
Explanation:
Given that:
mass of the plastic ball = 50 g = 50 × 10⁻³ kg
spring constant (k) = 2.22 × 10⁵ N/m
compression of spring (x) = 3.0 cm = 3 × 10⁻² m
a) Work done:
[tex]= \dfrac{1}{2}kx^2 \\ \\ = \dfrac{1}{2}\times 2.22 \times 10^{5}\times (3 \times 10^{-2})^2 \\ \\ = 99.9 \ J[/tex]
b) When the gun is fired horizontally;
In the spring, the potential energy is changed to kinetic energy.
i.e.
[tex]\implies \dfrac{1}{2}kx^2 = \dfrac{1}{2}mv^2 \\ \\ 2.22 \times 10^5 \times (3\times 10^{-2}) ^2 =50 \times 10^{-3} \times v^2\\ \\ \mathbf{v= 63.2 m/s}[/tex]
c) The max height the bullet will reach if the gun is being shot upward is:
[tex]H_{max}= \dfrac{v^2}{2g} \\ \\ H_{max}= \dfrac{63.2^2}{2\times 9.8}[/tex]
[tex]\mathbf{H_{max}= 203.9 \ m}[/tex]
9.) This 200 kg
stag that weighs
1,960 N on earth
would only weigh
324 N on the
moon. Calculate the moon's
acceleration due to gravity.
Answer:
Mass on moon = 33.06 kg
Explanation:
Given the following data;
Mass on earth = 200 kg
Weight on earth = 1960 N
Weight on moon = 324 N
To find the mass on moon;
First of all, we would determine the acceleration due to gravity.
Weight = mass * acceleration due to gravity
1960 = 200 * g
g = 1960/200
g = 9.8 m/s²
Next, we find the mass on moon;
Mass on moon = weight on moon/acceleration due to gravity
Mass on moon = 324/9.8
Mass on moon = 33.06 kg
Waves that move through space are called
Answer:
Electromagnetic waves are waves that can travel through matter or through empty space
Is telekinesis real??? I really wanna start learning it!
Answer:
if you only have to control your chakra and know how to get all your vibes to pass it to objects and it takes time to practice
Explain why the "X" chromosome expresses more traits than the "y" chromosome.
Please answer :( I have a lot of homework to do today! If it’s good I’ll mark b. Links or st————-upidity will get reported! Please help:3
Explanation:
The X chromosome (females have 2 of them while males have 1) is five times larger than the Y chromosome and has 10 times the number of genes.
A marble has a volume of 1 mL. How much water will it displace in a graduated cyclinder
A.
1 mm
B.
more than 1 mL
C.
less than 1 mL
D.
1mL
Isaac Newton mathematically derived _________ 3 laws. A- Aristotle's B- Kepler C- Copernicus's D- Galileo's
Answer:
derive Kepler's third law.
Explanation:
In this exercise you are asked to complete the sentence.
Kepler's third law states that the period squared is equal to the radius cubed of the orbit of the planets, multiplied by a constant.
Newton using the law of motion was able to mathematically derive Kepler's third law.
A 60 cm tall Siberian Huskey stands 3 m in front of a PLANE MIRROR and looks at its image. a) How tall is the image in the mirror? b) What is the characteristic of the image?
Explanation:
Given that,
Height of Siberian Huskey = 60 cm
Distance of Siberian Huskey and a plane mirror = 3 m
The characteristic of a plane mirror are as follows :
A plane mirror always forms a virtual image. The image and object are the same distance from the mirrorThe image size is the same as the object size.The image is upright.(a) The height of the formed image = 3 m
(b) The formed image is virtual, upright and same size that of object.
An electrical device in which a long wire is wound into a succession of closely spaced loops around a n insulating core is called a:
Circuit
Motor
Battery
Solenoid
Answer:
Solenoid I think.
Explanation: