Electromagnetic Spectrum - Worksheet | Printable and Distance ... - Free Printable

Let's solve the worksheet step by step.

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Q.1: Label the diagram of the electromagnetic spectrum

We are given a diagram of the electromagnetic spectrum with various wave types shown as icons and a horizontal scale showing wavelengths from 100 m to 0.0001 nm (which is 0.1 pm). The visible spectrum is in the middle, and we need to label the regions using the keywords:

- X-rays
- Gamma rays
- Infrared
- Ultraviolet
- Radio waves

Also, there are icons above the spectrum indicating sources or uses of each type.

#### Step-by-step analysis:

From left to right, the electromagnetic spectrum goes from longest wavelength (lowest frequency) to shortest wavelength (highest frequency):

1. Radio waves – Longest wavelength (~100 m to 1 m), used for AM/FM radio, TV.
2. Microwaves – ~1 cm to 1 m (not listed, but implied between radio and infrared).
3. Infrared – ~0.01 cm to 1 mm; emitted by warm objects, used in remote controls.
4. Visible light – ~700 nm (red) to 400 nm (violet); the rainbow-colored section.
5. Ultraviolet (UV) – ~10 nm to 400 nm; from the sun, causes sunburn.
6. X-rays – ~0.01 nm to 10 nm; used in medical imaging.
7. Gamma rays – shortest wavelength (< 0.001 nm); from radioactive elements, nuclear reactions.

Now, match the labels to the blanks in the diagram:

The diagram has five blank boxes above the waveforms:

From left to right:

1. Radio waves → corresponds to the longest wavelengths (100 m to 1 m), near AM/FM/TV icons.
2. Infrared → next, around 0.01 cm to 1 mm, near TV remote and light bulb.
3. Visible Spectrum → already labeled.
4. Ultraviolet → after visible, shorter than visible, near Sun and UV symbol.
5. X-rays → even shorter, near X-ray machine.
6. Gamma rays → shortest wavelength, near radioactive elements.

But only five blank boxes are shown. Let’s count them:

Looking at the image description:
- First box: under AM/FM/TV/Radar → Radio waves
- Second box: under TV Remote → Infrared
- Third box: under Light Bulb → Visible (already labeled)
- Fourth box: under Sun → Ultraviolet
- Fifth box: under X-ray machine → X-rays
- Sixth box: under Radioactive Elements → Gamma rays

So, the five blank boxes (from left to right) should be labeled:

1. Radio waves
2. Infrared
3. Ultraviolet
4. X-rays
5. Gamma rays

Wait — actually, the visible spectrum is centered and colored, so the three boxes around it may be:

- Left of visible: Infrared
- Right of visible: Ultraviolet
- Then further right: X-rays, then Gamma rays

And far left: Radio waves

So let's re-express:

Left to right order of EM waves:

1. Radio waves → longest λ → 100 m → AM/FM/TV/Radar
2. Microwaves → not listed, but between radio and IR
3. Infrared → 0.01 cm to 1 mm → TV remote, heat lamps
4. Visible light → 400–700 nm → light bulb, sun
5. Ultraviolet → 10–400 nm → sun, causes tanning
6. X-rays → 0.01–10 nm → X-ray machine
7. Gamma rays → < 0.001 nm → radioactive elements

So the five blank boxes in the diagram are likely:

- First (leftmost): Radio waves
- Second: Infrared
- Third: Ultraviolet
- Fourth: X-rays
- Fifth: Gamma rays

But wait — the visible spectrum is in the center, and the diagram shows three boxes on the left side of visible and two on the right?

Actually, looking at the scale:

- Wavelengths go from 100m → 1m → 1cm → 0.01cm → 1000nm → 10nm → 0.01nm → 0.0001nm

So:

- 100m to 1m: Radio waves
- 1cm: Microwave/infrared?
- 0.01cm = 100μm: Infrared
- 1000nm = 1μm: Near-infrared / visible boundary
- 10nm: UV/X-ray boundary
- 0.01nm = 10pm: X-rays
- 0.0001nm = 0.1pm: Gamma rays

Thus, the five blank boxes (in order from left to right):

1. Radio waves → 100m to 1m
2. Infrared → 0.01cm (100μm) to 1000nm
3. Visible spectrum → already labeled
4. Ultraviolet → 10nm to 100nm
5. X-rays → 0.01nm to 10nm
6. Gamma rays → < 0.01nm

But only five boxes are present. So likely:

- Box 1: Radio waves
- Box 2: Infrared
- Box 3: Ultraviolet
- Box 4: X-rays
- Box 5: Gamma rays

Yes, because the visible spectrum is already labeled, so the blank boxes are for the non-visible parts.

But the visible spectrum is shown as a red bar with "VISIBLE SPECTRUM" written across it. So the blank boxes are outside that.

So:

- From left to right:
- Radio waves → 100m to 1m
- Infrared → 0.01cm to 1000nm
- Ultraviolet → 10nm to 100nm
- X-rays → 0.01nm to 10nm
- Gamma rays → 0.0001nm

Wait — the wavelength scale shows:

- 100m → 1m → 1cm → 0.01cm → 1000nm → 10nm → 0.01nm → 0.0001nm

So the boxes are likely placed over:

1. 100m to 1m → Radio waves
2. 1cm to 0.01cm → this is microwave/infrared? But we have Infrared listed
- Actually, 1cm = 10,000 μm, 0.01cm = 100 μm, which is infrared
- So Infrared → 1cm to 0.01cm? No — decreasing wavelength: 1cm → 0.01cm → 1000nm → etc.
- So Infrared spans from ~1mm to 100μm? Wait — confusion.

Standard ranges:

| Type | Wavelength |
|------|------------|
| Radio | > 1 m |
| Microwaves | 1 m to 1 mm |
| Infrared | 1 mm to 700 nm |
| Visible | 700 nm to 400 nm |
| Ultraviolet | 400 nm to 10 nm |
| X-rays | 10 nm to 0.01 nm |
| Gamma rays | < 0.01 nm |

So now map the scale:

- 100m → Radio
- 1m → Radio/Microwave
- 1cm = 0.01m → Microwave
- 0.01cm = 0.1mm = 100μm → Infrared (far IR)
- 1000nm = 1μm → Infrared to visible
- 10nm → UV/X-ray
- 0.01nm → X-ray
- 0.0001nm → Gamma

So the boxes are:

1. 100m to 1m → Radio waves
2. 1cm to 0.01cm → Infrared (since 1cm = 10,000μm, 0.01cm = 100μm → still IR)
- But wait, 1cm is microwave, 0.01cm is IR? Yes — microwaves end at ~1 mm, so 1cm is microwave, 0.01cm = 0.1mm = 100μm → IR
- So Infrared starts at ~1mm → 0.01cm = 0.1mm → yes
3. 1000nm to 10nm → includes Visible and Ultraviolet
- But Visible is 400–700nm, so 1000nm to 400nm → Infrared to Ultraviolet
- So 1000nm to 10nm → Ultraviolet (400–10nm), and part of IR
- But the visible is in the middle, so the box just before visible might be Infrared, after visible → Ultraviolet
4. 10nm to 0.01nm → X-rays
5. 0.01nm to 0.0001nm → Gamma rays

So the five blank boxes are:

- Box 1 (leftmost): Radio waves → 100m to 1m
- Box 2: Infrared → 1cm to 0.01cm → 1000nm (but wait, 1cm = 10^4 μm, 0.01cm = 100μm → IR)
- But 1000nm = 1μm is much smaller than 100μm → so 1cm to 0.01cm is microwave to IR, but the box is probably labeled Infrared if it's near the TV remote
- However, the TV remote emits infrared at about 940 nm → very short IR

So the box at 0.01cm = 100μm is far IR, but TV remote is near IR, so perhaps the Infrared box is from 1000nm to 0.01cm? That doesn't make sense.

Better approach: use the icons.

Icons:

- AM/FM/TV/Radar → Radio waves
- TV Remote → Infrared
- Light Bulb → Visible light (and some IR)
- Sun → emits Visible, UV, IR
- X-ray machine → X-rays
- Radioactive Elements → Gamma rays

So the boxes are:

1. Under AM/FM/TV/Radar → Radio waves
2. Under TV Remote → Infrared
3. Under Light Bulb → Visible (already labeled)
4. Under Sun → Ultraviolet (because Sun emits UV)
5. Under X-ray machine → X-rays
6. Under Radioactive Elements → Gamma rays

But only five blank boxes — likely:

- Box 1: Radio waves
- Box 2: Infrared
- Box 3: Ultraviolet
- Box 4: X-rays
- Box 5: Gamma rays

And the visible is already labeled.

So final answer for Q.1:

Label the boxes from left to right:

1. Radio waves
2. Infrared
3. Ultraviolet
4. X-rays
5. Gamma rays

✔ Answer for Q.1:

> From left to right:
> 1. Radio waves
> 2. Infrared
> 3. Ultraviolet
> 4. X-rays
> 5. Gamma rays

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Q.2: Fill in the blanks

a) Wavelength is the distance between corresponding points of two consecutive waves.

b) Frequency is the number of complete waves that pass a given point in one second.

c) Electromagnetic spectrum represents the distribution of different electromagnetic radiation according to wavelength, frequency, or energy.

d) As the wavelength of electromagnetic waves increases, their frequency decreases.

(Recall: $ c = \lambda f $, so $ f = c/\lambda $ → as $ \lambda $ increases, $ f $ decreases)

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✔ Final Answers:

#### Q.1 Labels (from left to right):
1. Radio waves
2. Infrared
3. Ultraviolet
4. X-rays
5. Gamma rays

#### Q.2 Fill in the blanks:
a) Wavelength
b) Frequency
c) Electromagnetic spectrum
d) decreases

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