A similar reaction is used frequently in laboratory experiments as an indicator. Can you guess what that might be?

An electron in a hydrogen atom drops from energy level e3 to e2. what's the frequency of the emitted photon

castortr0y [4]

For this problem we can use 2 equations.
(1) - E = mC²
E = Energy of photon (J)
m = Mass of photon (kg) (1.67x10⁻²⁷ kg)
C = speed of light (3 x 10⁸ m/s)

(2) - E = hf
E = Energy of photon (J)
h = plank's constant (6.63 × 10⁻³⁴J s)
f = frequency of the photon (Hz)

(1) = (2)
hence, mC² = fh

by rearranging,
f = mC² / h
 f = 1.67x10⁻²⁷ kg * (3 x 10⁸ m/s)² / (6.63 × 10⁻³⁴J s)
 f = 2.27 x 10²³ Hz

3 0

3 years ago

Will give brainlist need answers asap

Serga [27]

Answer:

40 g

Explanation:

Find the line labeled KClO3 (which might take you a min, theres a lot of lines here)

Notice that when the line creates a direct point, you can measure the exact temperature needed to dissolve a certain amount (like how they gave 30 degrees and it lined up perfectly with the 10 g line. )

Since its asking for the amount at 80 degrees, all you need to do is trace the line to the 80 degree point, and look at the grams. (notice it made a direct point, so there definitely should be any decimals or guesswork)

By reading the graph, you can tell that at 80 degrees, it dissolves 40 grams, and that is your answer.

Hope this helps :)

3 0

3 years ago

2. Why can we eliminate the claim you circled?

Luda [366]

Answer: theres no image or claim

7 0

3 years ago

Read 2 more answers

A sample of carbon dioxide has a mass of 54.0 g.

cluponka [151]