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4 years ago

What is the photoelectric effect?

Physics

2 answers:

Veronika [31]4 years ago

5 0

Answer:

emissions of electrons from a metal

Explanation:

I did grad point

n200080 [17]4 years ago

4 0

the emission of electrons or other free carriers when light shines on a material.

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If cats always land on their feet, how do they get hurt when they fall?

Ulleksa [173]

The impact front the fall, depending on the distance, has an effect on the impact of their bones crushing with the pressure from the fall.

6 0

3 years ago

Theophylline, an asthma medicine, is to be prepared from an elixir with a drug concentration of 5 mg/mL and a cherry-flavored sy

zmey [24]

Answer:

$V_{syrup}= 60ml$ and $V_{elixir}= 40ml$

Explanation:

Well, we need 100ml of solution, with a concentration of 2mg/ml. So the total amount of drug we need is :

$M_{drug} =2\frac{mg}{ml}\times100ml = 200mg$

But the drug concentration is 5mg/ml, so the amount of elixir needed to get 200mg of drug is:

$V_{elixir}= \frac{200mg}{5mg/ml}=40ml$

And so the amount of cherry flavoured syrup needed is:

$V_{syrup}= 100-40 = 60ml$

Hope my answer helps.

Have a nice day!

7 0

3 years ago

An object's motion changes A. only if the object is at rest when a force acts upon it. B. only when a nonzero net force is appli

Tanzania [10]

B, only when a nonzero net force is applied, this means that the force is unbalanced, an object in motion stays in motion unless acted upon by an unbalanced force.

5 0

3 years ago

A drum is struck first with little energy. The drum is then struck with a lot of energy. Which sound will be louder? Why?

Reil [10]

Answer:

The drum struck with a lot of energy would be louder than the drum struck with little energy because there is a harder impact on it

Explanation:

5 0

3 years ago

A cyclist travelled 32 kilometers for both the 1st and 2nd hours. He took a 30 minute break to eat his lunch. He then travelled

Reika [66]

Answer:

The cyclist's average speed is 13.43 $\frac{km}{h}$

Explanation:

Speed is a quantity that expresses the relationship between the space traveled by an object and the time used for it. That is, speed is the magnitude that expresses the variation in position of an object and as a function of time, which would be the same as saying that it is the distance traveled by an object in the unit of time.

Average speed relates the change in position to the time taken to effect that change:

$speed=\frac{change in position}{time} =\frac{distance}{time}$

In this case:

total distance traveled= 32 km + 15 km= 47 km
total time= 3 hours that the cyclist travels + 30 minutes of rest = 3 hours + 0.5 hours (being 60 minutes equal to 1 hour, then 30 minutes equals 0.5 hours) = 3.5 hours

Replacing:

$speed=\frac{47 km}{3.5 h}$

and solving, you get:

speed= 13.43 $\frac{km}{h}$

The cyclist's average speed is 13.43 $\frac{km}{h}$

3 0

3 years ago