A photon with a wavelength of 2.29 × 10^–7 meter strikes a mercury atom in the ground state.Determine the energy, in electronvolts, of this photon.

Answers

Answer 1

Answer: energy, in electron volts, of this photon will be 5.43 eV

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A truck on a straight road starts from rest, accelerating at 2.00 m/s2 until it reaches a speed of 20.0 m/s. Then the truck travels for 20.0 s at constant speed until the brakes are applied, stopping the truck in a uniform manner in an additional 5.00 s. (a) How long is the truck in motion? (b) What is the average velocity of the truck for the motion described?

Answers

You can use the equation
V_xf = V_xi + a_x(t)

V_xf = 20.0m/s
V_xi = 0m/s
ax = 2.0t

Thus, solve for t and get 10secondsand then take 5 seconds to break after 20 seconds of drivingso for

a) 10 + 20 + 5 = 35 seconds

for part b)
You can use the formula
Delta x/Delta t = average velocity

Need to find xf, knowing xi = 0

Thus, use the formula
x_f = x_i + V_xi(t) + (1/2)a_x(t)^(2)
x_f = 0 + 0(10) + (1/2)(2.0)(10)^(2)
x_f = 100m

so for the first 10 seconds the truck traveled 100msAt a speed of 20m/s

20m/s = xm/20s20*20 = x
x = 400

thus we have 100+400 = 500mthen it slows down from 500m to x_f

thus I use the equation
x_f = x_i + (1/2)(V_xf + V_xi)t
x_f = 500 + (1/2)(0 + 20)(5)x_f = 500 + 50
x_f = 550

therefore the total distance traveled is 550m

to calculate average velocity
550/35 = 16m/s

thusV_xavg = 16m/s

Difference between perception and perspective

Answers

perspective is the evaluation or analysis of something, the way we think.
perception is a way of interpreting and understanding something.

Which particle builds a static electric charge when it is transferred from one object to another? A.proton

B.atom

C.electron

D.molecule

Answers

c, because of its electrical charge

From what is known about spring tides and neap tides, you can conclude that:_________. a. the sun’s gravity exerts the most power when the moon is on the opposite side of the Earth from the sun.
b. the height of high tides varies with the phases of the moon.
c. spring tides and neap tides affect the phases of the moon.
d. the moon revolves around the Earth every 14 days.
Please select the best answer from the choices provided

Answers

Answer:

Explanation:

Because neap and spring tides happen twice a month during new moon and full moon .It occurs twice in a month which is 14 days

Answer:

i think it is d

Explanation:

A swimmer can travel 2.30 m/s in still water. The swimmer heads directly west across a steam whose current is 1.20 m/s n. What is his velocity relative to the ground