Physics

Question 1

Physics

State properties that all waves have in common.

Answer 1

Reflect
Refract
Transfer energy without transferring matter
Have amplitude/wavelength/frequency

Not all waves can travel through a vacuum

Question 2

Physics

Symbol for a variable resistor

Answer 2

Rectangle with diagonal arrow across it

Question 3

Physics

Explain how the voltage across a fixed resistor changes when temperature of a thermistor in series decreases.

Answer 3

Resistance of thermistor increases;
Current through circuit decreases;
So voltage across fixed resistor decreases.

Question 4

Physics

How does the Doppler effect cause a change in the observed frequency of the waves?

Answer 4

Speed of waves constant;
If source moving away, wavefronts spread out / wavelength increases;
Speed = frequency x wavelength;
Higher wavelength and constant speed of waves gives lower frequency.

Question 5

Physics

Apparatus used to measure mass

Answer 5

Balance

Not scales

Question 6

Physics

State the principle of moments.

Answer 6

In equilibrium, sum of clockwise moments = sum of anti-clockwise moments