320 Lumen
320 Lumen
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 New Genuine UltraFire A3 R5 CREE XP G LED AAA 10440 Flashlight Superbright 320Lm  US $22.98
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 XTAR R01 CREE T6 LED 5 Mode Water proof 800Lm Rechargeable Flashlight Torch US US $51.99
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 UltraFire 501B 1000Lm CREE XM L T6 Led Flashlight Battery Charger Holster US $10.50
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 New Monster Flashlight R5 320 1 Cree R5 Tactical LED BRIGHT US $20.99
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 UltraFire CREE R5 LED Flashlight SureFire Barrel Mount US $19.72
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 UltraFire 3Mode 18650 CERR R5 LED Flashlight Set US $62.22
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 XTAR B01 CREE R4 LED Flashlight 320 Lumens Torch DIY Low Mid High StrobeS0S US $22.99
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 UltraFire 5 Mode 4000Lm 3 LED T6 Flashlight 18650 Battery Charger 37V 5000mAh US $58.81
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 Ultrafire Tactical WF 501C CREE XP G R5 335Lumen 1Mode LED Flashlight G90 Torch US $18.99
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 UniqueFire CREE R5 LED 6M Protect 14500 G10 Flashlight US $24.99
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 Ultrafire Tactical WF 501C CREE XP G R5 LED 335LM Flashlight G90 Torch Mount US $24.99
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 1pcs CREE 320LM 1M XP G R5 LED Bulb For SureFire 6P 9P US $9.60
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 UltraFire Tactical CREE R5 LED 320LM RCR123A 18650 16340 Flashlight Torch Defend US $21.58
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 3800 Lumen CREE XM L 3xT6 LED Flashlight Torch Tactical Hunting battery charger US $68.88
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 Eagletac G25C2 CREE XML LED 770 lumen Tactical Flashlight uses surefire batts US $109.00
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 Cree XP G R5 1 Mode 320Lumens White Light LED Drop in Module LED Flashlight 26 US $8.99
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 NEW Olight M20s x 500 Lumens Warrior special operations Tactical Flashlight US $74.49
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 UltraFire Tactical G60 CREE R5 LED 18650 Flashlight Kit US $24.99
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 Police CREE R5 LED 320Lm Tactical Flashlight CR123A Set US $78.50
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 UltraFire Tactical 320L CREE R5 1M LED Flashlight Set US $57.49
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 UltraFire CREE R5 LED 5Mod Flashlight Charger Mount Set US $51.99
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 UniqueFire CREE R5 LED AA 14500 6Mode G10 Flashlight US $22.50
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 Monster Flashlight P7C 900 3 SSC P7C 900 Lumens Tactical LED Flashlight 5 Mode US $12.62
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 Shotgun Rifle Tactical xenon 9V flashlight Torch Mount set kit US $19.99
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 UltraFire CREE R5 LED Flashlight Tactical 3000mAh Set US $67.70
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 CREE 320L 1M XP G R5 LED Bulb For SureFire 6P 9P E2 D3 US $9.44
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 UltraFire Tactical 320L CREE XP G R5 LED Flashlight Set US $48.59
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 XTAR TZ20 CREE XM L T6 LED 800Lumens Flashlight HolsterPressure Remote Switch US $59.99
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 UltraFire 320Lumens CREE R5 LED 1Mode Flashlight Torch US $29.88
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 UltraFire CREE R5 LED Flashlight USB Charger Battery US $49.99
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 Solarforce 320Lms XPG Cree Led 3 18V Bulb 4 Surefire US $12.90
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 UltraFire Tactical 380Lumens 5Mode CREE R5 LED Flashlight Torch G60 Mount Set US $24.55
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 511 Pc3300 Tactical Light For Life 200 Lumens Flashlight Reflective Yellow US $104.99
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 XTAR TZ20 Tactical 18700 CREE XM L U2 LED Flashlight Torch Mount MP1 Charger Kit US $80.99
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 Xtar B01 CREE XM L T6 LED 800Lumens DIY Low Mid High Strobe SOS Flashlight Torch US $58.99
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 Olight T20 R5 LED Tactical Flashlight Torch 270 Lumens w Strobe US Seller US $41.95
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 CREE Q5 LED Zoomable Adjustable Focus 320LM Mini Flashlight Torch Camping Light US $6.56
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 TZ20 800Lm 5 Mode CREE T6 LED Water proof Tactical Flashlight Torch in us stock US $67.99
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 New Olight T20 R5 LED Tactical LED Flashlight w Strobe 270 Lumens 2 X CR123A US $49.95
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 UltraFire WF 502B Cree XPG R5 LED 5 mode Flashlight US $18.00
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 NEW 3W Dual mode Rechargeable LED Flashlight Bike Light US $39.99
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 XTAR R01 CREE XM L T6 LED DIY Flashlight USB CABLE US $48.96
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 EagleTac G25C2 XM L U2 770 Lumen High Power Tactical Flashlight CR123A or 18650 US $109.90
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 Solarforce L2 BLK 5Mode R5 XPG Cree 320Lm Flashlight US $29.99
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 Solarforce 320Lms XP G Cree Led 3 18V Bulb 4 Surefire US $12.99
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 New LED LENSER X7R Rechargeable LED Flashlight Torch Hunting Camping SECURITY US $225.84
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 UltraFire Tactical CREE R5 LED 320Lumens 1Mode Flashlight Torch G60 Mount Set US $24.99
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 UltraFire Tactical CREE R5 LED 1Mode 320Lumens Flashlight Torch Bike Mount Kit US $23.99
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 XTAR Tz20 CREE XM L T6 LED 800Lm Flashlight Tactical Mount Remote Switch Set US $69.28
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 CREE R5 LED Bulb G2 6P Z2 C2 E2 M2 C1 L2 501 2 3A B CD US $15.98
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 XTAR TZ20 Tactical 18700 CREE XM L U2 LED Flashlight Torch WP2 II Charger Kit US $88.99
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 XTAR TZ20 Tactical 18650 CREE XM L U2 LED Flashlight Torch USB MP1S Charger Kit US $77.99
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 XTAR TZ20 Tactical 18650 CREE XM L U2 LED 820Lumens DIY Mode Flashlight Torch US $52.55
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 320Lumens 5M XP G R5 LED Bulb For SureFire 6P 9P G3 E2 US $17.99
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 Monster Flashlight Cree R5 LED Tactical Flashlight SET w BatteryChargerHolster US $37.99
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 UltraFire WF 504B XPG R5 Cree LED 18650 Flashlight Torch US $18.50
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 UltraFire WF 502B Cree XPG R5 5 mode LED Flashlight Torch US $19.50
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 400LM zoomable CREE Q5 SA 28 LED flashlight Three modes with Dimmer USA new US $9.98
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 Brand New LED LENSER P17 Torch Flashlight Gr8 for Hunting Camping Security US $100.60
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 Mini Flashlight Adjustable Focus Zoom Torch CREE Q5 LED Light Lamp 320LM Grey US $8.65
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 Rechargeable CREE XP G R5 320 Lumens 5 Modes LED Bulb For Surefire 6P6PDC2Z2 US $39.99
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 Olight M20S Warrior Premium R5 Flashlight with Free CR123A Rayovac Batteries US $69.95
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 XTAR R01 CREE XM L T6 LED 800 Lumens Rechargeable Flashlight5 Modes USB Cable US $57.80
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 New Monster Flashlight Cree R5 Tactical LED BRIGHT US $26.99
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 XTAR New TZ20 CREE R4 LED 320Lumens DIY MidLowStrobeSOS modes Flashlight US $36.60
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 UltraFire WF 503C R5 Cree LED 5 mode Flashlight US $23.50
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 Solarforce XP G Cree R5 320Lms 3Mode Led Bulb 08 42V US $16.95
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 Solarforce XP G Cree R5 320 Lms Led Bulb 3 18V 4 6P 9P US $15.95
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 OLIGHT M31 Triton SST 50 LED Flashlight3000mah Bat set US $152.99
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 RQ08 CREE XPG R5 5 mode LED 18650 Flashlight Torch Battery Charger US $33.00
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 UltraFire WF 502B CREE R5 LED 5 mode 18650 320 Lumen Flashlight Torch Combo US $31.50
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 UltraFire WF 502B CREE R5 LED Flashlight Torch with Battery and Charger US $31.50
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 UltraFire WF 502B Cree XPG R5 LED Flashlight Torch Combo with Battery Charger US $29.50
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 UltraFire C1 Cree XPG R5 LED 5 mode Flashlight Torch with Battery Charger US $37.50
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 Manta Ray M50B 5 mode CREE XPG R5 LED 18650 Flashlight Torch 320 Lumen US $16.50
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 New CREE T6 LED 800lm 5 Mode Waterproof Flashlight Torch B01 Fast Ship In US US $53.99
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 Spiderfire CREE R5 XP G 5Mde LED Spare Bulb 6p G2 D2 G2 US $14.75
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4 physics problems. I need some help. I'm having trouble! PLEASE?
What is the frequency of a microwave that has a wavelength of 3.0 cm?
1.0 x 1010 Hz
1.0 x 10-10 Hz
1.0 x 105 Hz
1.0 x 10-5 Hz
What is the illumination 4.0 meters below a 405 lumen lamp?
2.0 lux
20 lux
4.0 lux
40 lux
A student wishes to compare the luminous flux from a bulb with that of another 1750 lm lamp. The two bulbs illuminate a sheet of paper equally. The 1750 lm lamp is 1.25m away; the unknown bulb is 1.08m away. What is its luminous flux?
3.43 x 104 lumens
2.75 x 104 lumens
1.21 x 103 lumens
1.31 x 103 lumens
The illumination on a tabletop is 2.0 x 101lux. The lamp providing the illumination is 4.0 m above the table. What is the intensity of the lamp?
100 candela
220 candela
290 candela
320 candela
A. c = fλ, c = 3x10^8 m/s, λ = 0.03 m
f = c/λ = 3x10^8 / 3x10^-2 = 1x10^10 Hz
1. illuminance: E = Φ/A, units: lux,
where:
Φ=> luminous flux, units: lumen,
A => surface area: 4πr²
E = 405/4π(4²) = 2 lux
2. E1 = E2
1750/4π(1.25²) = x/4π(1.08²),
x = 1750(1.08/1.25)² = 1750(0.7465) = 1306 lumen
3. Φ = EA = (2x10)4π(4²) = 4πI,
Intensity: I = Φ/4π = (2x10)(4²) = 32x10 = 320 candela
October 30th, 2003 in
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