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What is the photoelectric effect?

The photoelectic effect is when photoelectrons are released from a metal that light is incident upon. The photoelectrons are only emitted when the photons of light are above a certain threshold frequency and...
GR
Answered by Gemma R. • Physics tutor
2620 Views

A ball is fired at an angle of 50 degrees with a velocity of 10 ms^-1, at what time does it first hit the floor?

First we must decide how we can begin to solve the problem. With problems such as these it is best to split the velocity into a vertical and horizontal component. To do this we construct a triangle, this can...
JU
Answered by Joseph U. • Physics tutor
3312 Views

What is the photoelectric effect?

The photoelectric effect refers to the emmision of electrons from a surface, usually a metal, as a result of shining light (EM radiation). The light is absorbed by the electrons on the surface and thus the e...
MC
Answered by Michalis C. • Physics tutor
2483 Views

A 1kg spring has an unloaded length 10cm and has an elastic constant of 100N/m. It is compressed to 6cm then placed facing upwards on the floor. When released it travels vertically upwards. How high does it jump? You may assume no energy is lost to heat o

This may at first look like a horrible SUVAT problem, but it is actually testing your ability to calculate energy transfers. It is helpful for these questions to first draw a diagram then work out what energ...
PW
Answered by Philip W. • Physics tutor
3987 Views

What is an ohmic resistor? How to check if a resistor is ohmic?

An ohmic resistor is a resistor that obeys Ohm's law V = IR (voltage = current x resistance). Therefore, if the voltage in such element is increased by n number of times, by the same number n has to increase...
JV
Answered by Jonas V. • Physics tutor
39517 Views