Ask question

Ask question

All categories

3 years ago

9

determine the longest wavelength of light required to remove an electron from a sample of potassium metal, if the binding energy

for an electron in k is 1.76 × 103 kj/mol.

1 answer:

9966 [12]3 years ago

5 0

Answer:

The wavelength of light is 68 nm

Explanation:

You might be interested in

What is it called when objects become positively charged when they lose electrons and negatively charged when they gain electron

Alexeev081 [22]

It is c: electric charge

4 0

3 years ago

Read 2 more answers

3. what could you do to increase the precision of your measurements? What factors limit the

Vika [28.1K]

Answer:

Use specific tools built specifically for that specific measurement.

Explanation:

8 0

3 years ago

An iron block of mass 10 kg rests on a wooden plane inclined at 30° to the horizontal. It is found

Kaylis [27]

I assume the 100 N force is a pulling force directed up the incline.

The net forces on the block acting parallel and perpendicular to the incline are

∑ F[para] = 100 N - F[friction] = 0

∑ F[perp] = F[normal] - mg cos(30°) = 0

The friction in this case is the maximum static friction - the block is held at rest by static friction, and a minimum 100 N force is required to get the block to start sliding up the incline.

Then

F[friction] = 100 N

F[normal] = mg cos(30°) = (10 kg) (9.8 m/s²) cos(30°) ≈ 84.9 N

If µ is the coefficient of static friction, then

F[friction] = µ F[normal]

⇒ µ = (100 N) / (84.9 N) ≈ 1.2

5 0

2 years ago

Astronauts are trained for take-off in a high-speed centrifuge of 4.7 m radius that spins in the horizontal plane.

Leokris [45]

Answer:

a) $1.94 \frac{rad}{s}$

b) $9.12\frac{m}{s}$

c) Towards the center of the centrifuge

Explanation:

a)

Becuse the centrifuge rotates in circular motion, there's an angular acceleration tha simulates high gravity accelerations

$a_{rad}=\omega r^{2}$

with r the radius and ω the amgular velocity, in or case $a_rad=3.5g$ so:

$3.5g=\omega r^{2}$ and g=9.8 $\frac{m}{s^{2}}$

solving for ω:

$\omega=\frac{3.5g}{r^2}=\frac{3.5*9.8}{4.2^2}$

$\omega = 1.94 \frac{rad}{s}$

b) Linear speed (v) and angular speed are related by:

$v=\omega r =(1.94)(4.7)$

$v= 9.12\frac{m}{s}$

c) The apparent weigth is pointing towards the center of the circle, becuse angular acceleration is pointing in that direction.

8 0

3 years ago

Mark each of the following statementsas true or false. If a statement refers to "two objects"interacting via some force, you are

slega [8]

Answer:

Explanation:

A,D,E

8 0

3 years ago