P=E/t
E=67,500J
t=45s
P=?
P=67,500/0.45
= 150000W
Answer:
because of tungsten's high melting point
Explanation:
Answer: representative sample
Explanation:
A representative sample can be defined as a subset of the population. This sample includes subgroups that reflect the features of the larger group and are chosen for a specific purpose of study. For example, a classroom with 60 students having 30 females and 30 males, can generate a representative sample based on the gender differences.
Answer:
y = L h / a √√ (2q V m)
Explanation:
This is a diffraction exercise, so we must use the D'Broglie relation to encode the wavelength of the electron beam.
p = h / λ
λ= h / p
the moment is
p = m v
λ = h / mv
Let's use energy conservation
E = K
q ΔV = ½ m v²
v = √ 2qΔv / m
λ = h / (m √2q ΔV / m)
λ = h / √ (2q ΔV m)
Having the wavelength of the electrons we can use the diffraction ratio
a sin θ = m λ
First minimum occurs for m = 1
sin θ = λ / a
let's use trigonometry for the angles
tan θ = y / x
as in these experiments the angles are very small
tan θ = sin θ / cos θ = sin θ
sin θ = y / x
we substitute
y / x = λ / a
y = x λ / a
we replace the terms
y = L h / a √√ (2q V m)