Question

name

1. which of the following statements is false?

a) a radio wave has a higher frequency than red light.
b) an ultraviolet wave has higher frequency than a radio light
c) a microwave has a higher frequency than a radio wave.
d) a red light has a higher frequency than a microwave.

1. the units of frequency are

a) hz
b) f
c) seconds
d) m/s

1. the units of period are

a) hz
b) f
c) seconds
d) m/s

1. the units of hertz are the same as the units of

a) seconds²
b) m/s
c) 1/seconds
d) 1/m

1. the units of wavelength are

a) seconds
b) inches
c) meters
d) miles

1. which of the following greek letters is used to represent wavelength?

a) π
b) λ
c) δ
d) σ

1. the variable or symbol used to represent period is

a) t
b) t
c) p
d) s

1. the number of cycles completed each second is called the

a) frequency
b) wavelength
c) wave speed
d) period

Explanation:

• Question 7:
• Radio waves have lower frequencies than red light. Ultraviolet has higher frequency than red light. Microwave has lower frequency than red light. Red light has higher frequency than microwave.
• Question 8:
• Frequency is measured in Hertz (Hz).
• Question 9:
• Period is the time taken for one cycle, so its unit is seconds.
• Question 10:
• Hertz (Hz) is equivalent to \(1/\text{seconds}\) (since frequency \(f=\frac{1}{T}\), where \(T\) is period in seconds).
• Question 11:
• Wavelength is a measure of distance, and meters is a standard unit for distance (in SI system).
• Question 12:
• The Greek letter \(\lambda\) (lambda) is used to represent wavelength.
• Question 13:
• The symbol \(T\) is commonly used to represent period.
• Question 14:
• Frequency is defined as the number of cycles completed per second.

Answer:

1. a) A radio wave has a higher frequency than red light.
2. a) Hz
3. c) seconds
4. c) 1/seconds
5. c) meters
6. b) \(\lambda\)
7. a) \(T\)
8. a) frequency