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yulyashka [42]
3 years ago
7

A light beam shines through a slit and illuminates a distant screen. The central bright fringe on the screen is 1.00 cm wide, as

measured between the dark fringes that border it on either side. Which of the following actions would decrease the width of the central fringe? ( There may be more than one correct answer)
a- increase the wavelength of the light
b-decrease the wavelength of the light
c-increase the width of the slit
d-put the apparatus all under water
Physics
1 answer:
Pachacha [2.7K]3 years ago
4 0

Answer:

B, C, D.

Explanation:

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Answer:

should be the answer B

Explanation:

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What is one defining feature of a prokaryotic cell
trapecia [35]
A. nucleus
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3 years ago
An electron in the n = 7 level of the hydrogen atom relaxes to a lower energy level, emitting light of 397 nm. what is the value
Dimas [21]

Answer:

n_f=2

Explanation:

It is given that,

Initially, the electron is in n = 7 energy level. When it relaxes to a lower energy level, emitting light of 397 nm. We need to find the value of n for the level to which the electron relaxed. It can be calculate using the formula as :

\dfrac{1}{\lambda}=R(\dfrac{1}{n_f^2}-\dfrac{1}{n_i^2})

\dfrac{1}{397\times 10^{-9}\ m}=R(\dfrac{1}{n_f^2}-\dfrac{1}{(7)^2})

R = Rydberg constant, R=1.097\times 10^7\ m^{-1}

\dfrac{1}{397\times 10^{-9}\ m}=1.097\times 10^7\ m^{-1}\times (\dfrac{1}{n_f^2}-\dfrac{1}{(7)^2})

Solving above equation we get the value of final n is,

n_f=2.04

or

n_f=2

So, it will relax in the n = 2. Hence, this is the required solution.        

6 0
3 years ago
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How does electrical conduction compare between metals, nonmetals, and metalloids
zhuklara [117]

Answer:

metal> metalloids >nonmetals    (Electrical conductivity)

Explanation:

Electrical conductivity of objects can be compared by the bonding energy of electrons in them.

Metals have less bonding energy of electrons, so even at room temperature their are significant number of free electrons to carry electrical current.

Nonmetals have a very high bonding energy of electrons, so  at room temperature negligible number of free electrons are present so electrical conductivity is very low.

Metalloids have both metallic and non metallic features. The electron bonding energy falls in between that of metals and nonmetals. So electrical conductivity also lies in between metals and nonmetals.

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3 years ago
What is someones target heart rate at 70% at age 17​
baherus [9]

Answer: normal

Explanation:

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2 years ago
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