Question

1. what is the unit used to measure frequency?

a) meters
b) seconds
c) hertz
d) watts

1. what part of a wave is the lowest point?

a) crest
b) trough
c) amplitude
d) speed

1. if a wave has a high frequency, it means:

a) the waves are far apart
b) the waves pass by slowly
c) more waves pass a point each second
d) the amplitude is small

Explanation:

Question 1

• Meters measure length, seconds measure time, watts measure power. Hertz (Hz) is the unit for frequency (cycles per second).

• Crest is the highest point, amplitude is the height from midline to crest/trough, speed is wave velocity. Trough is the lowest point of a wave.

• High frequency means more cycles (waves) occur per unit time (second). Far apart waves mean low frequency, slow passing is low frequency, amplitude is unrelated to frequency.

Answer:

c) Hertz

Question 2